Sort by
Relevancy

Free Stories

100%
Hung Trans Lesbians Fuck Two Ladyboys
Note 1: If you like Transsexuals, Trans Lesbians, Asian Ladyboys, Big Cocks, Extreme Cock Sucking, Anal Fucking, Anal Fisting, Semen Swallowing, Role Play, Orgies, BDSM, Cock Sounding and Foot Fetish this story is for you. Note 2: All the characters are over 21. The names are fictitious, but some... Read full Story
darrell 2022-01-03 4,250 Group Sex Big Tits Cumshot Bareback Fetish Blowjob Big Cock Asian Ladyboy Sex Toys Mature cum in mouth shemale + shemale
100%
Big Dick Alessia Visits Dallas
Alessia Hung Mature MILF travels to visit a Big Dicked Man and his Sexy Household If you like Transexuals, big cocks, bondage, BBWs, big clits, deep throat, fisting, 69, ass fucking, sounding, piercing, cum swallowing and big loads this story is for you. If not don't bother reading. If you fav... Read full Story
darrell 2022-04-20 4,269 Group Sex Cumshot Shemale Fucks Guy Blowjob blonde Big Cock Asian Shemale and Girl Sex Toys Mature Ass to Mouth shemale + shemale
85%
My Awkward Phase
My Awkward Phase ©Alexandra Rios 2019 The greatest lie is that what happens in high school doesn't matter, because life begins in college. I pretended to agree, although I never believed it, for I was the world's greatest liar. Wannabees I was hanging out with my friends Quinn, Barb and Anne ... Read full Story
the greatest liar 2019-06-14 11,768 Small Tits anal sex Latina Masturbation Bareback Creampie Blowjob Big Cock transformation gangbang Shemale and Girl Guy Fucks Shemale Sex Toys Ass to Mouth cosplay hormones high school real life situations
95%
First time
Hi, my name is Sandra. In fact, I'm not exactly a girl, but a CD. Even as a child, I felt different and I used every opportunity when I was left alone in the apartment to dress up, to put on women's clothes, to put on make-up. In time, I started watching porn, as did all my friends. But, unlike them... Read full Story
cd Sandra 2021-10-13 5,607 Stockings Teen (18+) Small Tits Crossdresser blonde Guy Fucks Shemale
60%
Susan's First Time Part 4
The shadows of late afternoon crept across the city when Susan paid the cabbie off. Why had 'he' wanted her to come down to this neighborhood? She looked around with apprehension at the garish lights of bars and adult bookstores flashing in the growing darkness. One or two streetlights flickered on ... Read full Story
shemale lover 2011-10-14 3,056 Small Tits shemale massage
72%
ACROSS THE STREET AND TWO DOORS DOWN by Spanky de Bautumn
Jamie knew he was different. He didn’t fit in with the other boys, but he didn’t feel like he fit in with the girls either, he just knew he was different. He wasn’t into dolls or balls. He was the smallest boy in his class and more than half the girls outweighed him. But the one thing he had going f... Read full Story
SpankydeBautumn 2021-01-29 11,292 Teen (18+) Small Tits Crossdresser Fetish Blowjob Lingerie Guy Fucks Shemale cum in mouth
100%
Unexpected Twist
I'm a reporter for a regional newspaper in Germany, in my 30's and always in search of a good story. Last summer, while visiting a local pride festival for a short report, I got in contact with the regional queer community. A few months before, a new editor-in-chief took over in our office, a very c... Read full Story
webandy87 2023-11-22 6,932 Small Tits Amateur Masturbation sucking Blowjob blonde Homemade femboy young ts
66%
Sex in the kitchen with my hubby's friend - a cop
Ever since my wedding last year, I enjoy a great time with my hubby who loves me so much and takes care of me so much. Since he is married and having another family, he doesn’t stay with me all the time, but comes and stays at least 2 or 3 days in a month and we literally celebrate those nights wit... Read full Story
Manusha Tranny 2021-10-14 5,112 Small Tits Crossdresser Amateur Cumshot Outdoor Blowjob Big Cock Asian Ladyboy Guy Fucks Shemale Ass to Mouth cum in mouth
100%
TO BE OR NOT TO BE – PART 2
TO BE OR NOT TO BE – PART 2 by Spanky de Bautumn Part 1. Sunny, Mel, and Shari learn they are going to New York to perform a play off Broadway and are really excited about it. Being a small troupe, we unseen members had to wear many hats. Unfortunately, there was just the two of us, Joe Donn... Read full Story
SpankydeBautumn 2021-02-22 3,572 Small Tits Crossdresser Cumshot Bareback Blowjob Big Cock Lingerie Guy Fucks Shemale Interracial cum in mouth
33%
NERVOUS MEETING
On a cool fall evening I was walking about town when I came across a sign outside a coffee shop saying, "lonely? stop in for a cup and new friends". It was plain except for the light rainbow in the center of the sign. Being curious and also a bit lonely myself, I stepped inside. It was nothing m... Read full Story
77James 2022-01-03 2,023 Small Tits Homemade cum in mouth diaper
71%
The story of how I became what I am now...
I was on a trip to Germany with some of my friends. I was 16 when this happened. We went to a club one night and I got really drunk. They challenged me to approach a cute girl and ask her for a drink with me. I was drunk so I didn't really care so I went there and bought her a drink. We talked and I... Read full Story
FeetQueen 2019-01-08 5,316 Stockings Teen (18+) Small Tits Amateur Shemale Fucks Guy Lingerie Homemade cum in mouth
100%
Camming Down the Rabbit Hole Ch. 07
Opening my eyes I struggled a little as the residual cum on my face from last night’s show hadn’t been fully wiped off, I felt the dry and crusty leftovers crinkle on my skin, but couldn’t help but smile to myself as I remembered how it had got there. The intensity of that orgasm had been on another... Read full Story
Dani_does_Dallas 2021-10-22 6,263 Stockings Small Tits Crossdresser Amateur Cumshot Masturbation Fetish Lingerie Sex Toys Homemade self sucking pov cum in mouth
90%
Camming Down the Rabbit Hole Ch. 08
A familiar sensation greeted me as my eyes opened and a yawn escaped my mouth, that oh so delicious feeling of my morning wood straining against my silk night ware. It was becoming an ever occurring pattern that no matter how large the orgasm the night before I would wake with the hardest of cocks, ... Read full Story
Dani_does_Dallas 2021-11-15 3,816 Stockings Small Tits Crossdresser Amateur Cumshot Masturbation Fetish Uniform Lingerie Homemade self sucking pov cum in mouth
78%
A Little Girl Forever
Since I was a little girl I dressed in my sister's clothes, she knew it and she kept clothes for me and sometimes she bought clothes thinking about me. She was my accomplice and still is. When I was alone I dressed totally as a woman and I felt totally satisfied and realized as such, this included m... Read full Story
Mabel Cecilia 2019-05-06 7,947 Small Tits Crossdresser Amateur Cumshot Latina Masturbation Creampie Blowjob blonde Lingerie Shemale and Girl Guy Fucks Shemale Sex Toys Mature self sucking Solo Shemale cum in mouth double anal shemale + shemale
42%
sexy jane story
I love the idea being a crossdresser wearing women outfit bars in panties n sexy outfit not just for the sex I love sex being on my knees sucking cocks in getting fuck by a big cock see win I was very young I had sex with 3 guys one day they ask me will I suck there cocks in I sand yes we want insid... Read full Story
45sexyjane 2019-05-27 4,141 Small Tits Crossdresser Amateur Big Tits Masturbation Blowjob blonde Big Cock gangbang Lingerie Sex Toys shemale + shemale sexy crossdresser
91%
My Seductive Secret (True Story)
During my childhood, me and my brother used to play with two other boys who were our neighbors every weekend. One day we decided to wrestle, and I took on the youngest one, (he was about 2 years younger than me, like my brother) and we wrestled in the shed while my bro and his bro (who was my age) w... Read full Story
Chickzdigmeyup 2019-06-18 13,966 Stockings Teen (18+) Small Tits Crossdresser Cumshot Outdoor Masturbation Bareback Fetish Blowjob Big Cock Lingerie domination Sex Toys Homemade cum in mouth
80%
One night Transtand ;)
One Night Transtand By BalkanMan990 Published on Lush Stories on 05 Oct 2019 I had no idea she was a trans.. I didn't stop kissing or fondling her when I found out. I went out for a drink at one of the many bars at Croatia,where my girlfriend Sabina and I were staying.Sabina and I had been drin... Read full Story
BalkanLoco91Ri 2019-10-24 8,855 Small Tits Amateur Cumshot Masturbation Creampie Shemale Fucks Guy Blowjob blonde Lingerie Guy Fucks Shemale Homemade pov cum in mouth
100%
Playfull Sexy Shemale LindaTgirl
The overwhelming passion will start. When you date me... it will all start with kisses and wrapping with my legs around your body and showing of her gorgeous smal tits.The, while sitting on your lap I will whisper in your about what will be next.. About what turns me on... about sucking, licking,... Read full Story
TS-Linda. 2022-02-21 2,459 Small Tits Amateur shemale Lingerie escort money latina ass PAWG Pawg Tranny lindatgirl
38%
Am I gay?
Please help me. I'm confused and unsure if I am gay. I feel so ashamed of myself. I don't want to be gay but I was molested by my neighbors at 6 years old and from then on I would wear my mom's panties or sniff my sisters while masturbating. Cumming would always make me feel guilty for what I have d... Read full Story
Chinaysissyslut 2020-02-24 6,138 Stockings Teen (18+) Small Tits Crossdresser solo Amateur Masturbation Asian Ladyboy Lingerie Homemade webcams
85%
BANGING AROUND BANGKOK
BANGING AROUND BANGKOK: THE AMOROUS ADVENTURES OF CAITLIN "MEOW" MORRISON after living and working in Thailand/SE Asia for many years i decided to write an erotic story based on some of the people i have known, venues and places i have been, and the P4P night-scene where i spent way too much... Read full Story
bkkldby 2019-06-17 14,026 first time Teen (18+) Amateur Group Sex Big Tits Cumshot Outdoor Bareback Blowjob Big Cock Asian lesbian public place
100%
A Perfect Pandemic: A Transsexual Transition in a Troubled Time
A Perfect Pandemic A Transsexual Transition in a Troubled Time A Novelette by Alexandra Rios Text Copyright Reserved © August, 2021 Dedication Transgender Day of Remembrance is a solemn occasion. I am offering “A Perfect Pandemic” for free as an antidote to the fear, phobia, discrimination, d... Read full Story
the greatest liar 2021-11-16 5,050 Teen (18+) Crossdresser Group Sex Big Tits Bareback Creampie Big Cock gangbang domination Guy Fucks Shemale Interracial double anal webcams
50%
An alumni gathering like no other; 2/2
... I opened my eyes, sobered up from the alcohol and my lust. Simo had already left. I had to get ready for the party, and I had to do it like a man! BUT, slut that I am, to make my breasts more prominent under my dark purple tank top, I tightened a transparent strap around my waist. You never kno... Read full Story
hippocampus_171 2024-06-16 685 anal Amateur Creampie Blowjob Sex Toys Mature small cock big ass cum in mouth
100%
Camming down the rabbit hole Ch1
Back in January 2020 I guess I was lucky, I did have a regular job although the pay was miserable and I did have my own place. On my wage all I could afford was a miserable bedsit in a neglected part of town, but on the upside I didn’t have to flat share and it worked well enough for me. The west... Read full Story
Dani_does_Dallas 2021-08-11 5,325 Crossdresser solo Amateur Masturbation Lingerie Homemade webcams
90%
My True-Love Story
My name is Kim Young. I'm a happy and healthy nineteen this year. This is my very first story (but not my first "submission!") My story begins five years ago, when our neighbors moved in next door. I'll always remember that sunny April afternoon in Omaha, when they climbed out of their ... Read full Story
shemale lover 2012-09-10 5,715 Crossdresser Blowjob pissing Lingerie handjob
100%
Tight Spot
XtinaSmith2017 Cody bit his lip as he looked over towards the shop, a little anxious about their planned endeavor but not wanting to come off as uncool to his friends, "Are you sure this is a good idea?" he asked. His friends grinned and laughed, playfully nudging him as they made their way ... Read full Story
Gwapo67 2022-07-22 5,763 Big Tits Bareback Creampie Shemale Fucks Guy Fetish Blowjob Big Cock Lingerie domination cum in mouth
100%
Sweet Encore
I was alone tonight and feeling just a bit paranoid as I listened to the soft music. The soothing sounds put me in a seductive mood, but It seemed that all my lovers were too busy for me, or they had other plans. Uncle Barney and my detective were probably home being dutiful husbands. Bo was under h... Read full Story
Regina10 2024-05-09 2,379 Crossdresser Big Tits Bareback Creampie Blowjob blonde Big Cock Guy Fucks Shemale big ass Ass to Mouth
100%
The Biology of Music - I fucked my trans substitute teacher
I was never strong in school. I wasn't very interested in what we were being taught, and the teachers liked me enough to not give me too hard a time about it. I attended an all boys school. It was actually quite a religious school which makes this story all the more surprising. I was in the middle c... Read full Story
terrifictim 2022-01-03 3,784 Creampie Guy Fucks Shemale feet licking first time with a tranny teacher student
100%
Camming Down the Rabbit Hole Ch. 10
As the sun beamed in through a gap in the curtains my now familiar morning wood strained at the silk of my nightwear. How was it that no matter how hard I came the night before it would wake up eager and ready to go. As had become customary my mind would be filled with the events of the previous nig... Read full Story
Dani_does_Dallas 2022-04-12 3,407 Crossdresser solo Amateur Cumshot Masturbation Lingerie Sex Toys Homemade self sucking cum in mouth webcams
100%
Neighborhood Restaurant Surprise - Kimi
I - The Meeting In the neighborhood restaurant I frequented weeknights after work, I had developed a friendly relationship with several of the college kids who worked as servers. Always having been attracted to the most feminine and petite of girls, dark, almond shaped eyes being a super plus, I ... Read full Story
shemale lover 2012-04-11 5,079 anal sex Cumshot fingering oral sex small breasts
100%
Camming Down the Rabbit Hole Ch. 11
I sat there for some time, my phone still in hand. I couldn’t fully comprehend the situation and where I was. All this started when I was put on furlough and thought I would be losing my job, an idea born out of boredom, hornieness and desperation. What started as a regular cam show with a guy hopin... Read full Story
Dani_does_Dallas 2022-04-25 4,142 Crossdresser Amateur Cumshot Masturbation Blowjob Uniform Lingerie Shemale and Girl Sex Toys Homemade self sucking pov cum in mouth
88%
Girl from Uncle
Tonight, I have to tell it all. It’s no secret that my uncle and I had a very special bond he had been eyeing me with those adventurous eyes from the time that I was 14 years old. And frankly I enjoy his ogling. I could feel my nipples get so hard when he looked through me with those alert and spark... Read full Story
Regina10 2024-02-14 5,099 anal Crossdresser Big Tits Bareback Blowjob Big Cock Ebony Lingerie Guy Fucks Shemale big ass femboy Ass to Mouth cum in mouth
94%
Tortured by the T-Girl Tutor
Duncan didn't quite know how to handle it. He'd planned on a quiet Winter Break. Sleeping til noon, watching too much television and eating tons of junk food. That kind of stuff. He had a whole two weeks off from community college. At school, he was an outcast. They say life gets better after hi... Read full Story
shemale lover 2012-12-18 33,946 Big Tits shemale Big Cock Lingerie domination
100%
Dormitory Fire Drill
The bed in Beverly's dorm room was narrow. It forced their naked bodies close. That was fine with Les, it increased the intimacy. As they spooned together, Les's arm draped across her waist and fondled the bottom of her left breast. His face pressed into the hair at her neck and inhaled the wonderfu... Read full Story
shemale lover 2012-10-31 3,323 Fetish orgasm Lingerie
56%
Blow Job
My e-mail is: My rusted, green Toyota Tercel pulls into the mall parking lot. I pick a spot at the back, beyond where even employees park. The next car is a blue pickup 20 spots away. No one parks here, except at Christmas. But I know that I'll soon need the privacy. I'm a freak, a cross-dresser... Read full Story
shemale lover 2013-08-09 6,859 Crossdresser Masturbation Lingerie stripping party
91%
HOW MY AUNT AND SISSY NEPHEW CHANGED MY LIFE FOREVER! (fictional
It was the very first night of my month long North Carolina July summer vacation stay when my Aunt Meg suddenly entered the bedroom that I was temporarily sharing with my younger cousin Rudy. Being so openly effeminine in his body language,voice and looks, I had already planted such dirty thoughts ... Read full Story
CDDIXIE4U 2019-01-08 33,472 Teen (18+) Crossdresser Cumshot Masturbation Bareback Shemale Fucks Guy Fetish Blowjob Big Cock Ladyboy Lingerie domination Homemade Compilation cum in mouth shemale + shemale
95%
Proud To Be A Sissy Chapter 8
I woke up to hear daddy lightly snoring and in my sleep I had draped a leg over him so that my body was almost covering him. I giggled to myself realizing that even in my sleep the sissy slut in me reached to grasp his flaccid penis. Then I curled closer up against daddy and contemplated about how m... Read full Story
shemale lover 2012-12-24 9,181 Teen (18+) Crossdresser Uniform Lingerie domination
100%
Camming Down the Rabbit Hole Ch. 09
As per my previous mornings recently, I stirred and rubbed the sleep from my eyes, that delicious feeling of my silk night ware stretching over my taught nipples and my morning wood throbbing in its lace enclosure. The urge to touch myself was palpable, it seemed no matter how hard I came the night ... Read full Story
Dani_does_Dallas 2022-03-22 3,365 Stockings Crossdresser solo Amateur Cumshot Masturbation Lingerie Sex Toys Homemade self sucking pov cum in mouth webcams
81%
That night....
I was extremely nervous when I pulled out my phone and dialed the number. Never before, in my wildest dreams, had I thought I would act on one of my strongest fantasies. I knew I would be nervous when I first met her, but after exchanging pictures and seeing that big, fat cock of hers, I knew I ha... Read full Story
bigTHICKY 2017-05-08 9,217 Big Tits Cumshot Latina Big Cock Ladyboy cum in mouth
100%
Don't Go Into The Woods
Prologue I am standing here wearing a red plaid schoolgirl uniform skirt. It is so short that although I looked in the mirror before and couldn’t see my white satin panties I felt anyone looking at me could. My blouse is a white collared blouse typical of what you’d expect to see on a... Read full Story
shemale lover 2011-11-10 5,135 sucking Lingerie spanking
50%
Hard Decisions by Elaine © 2020
Hard Decisions by Elaine © 2020 No one in this story is based on anyone alive or dead. It is a work of fiction and should not be read by minors. I appreciate the kind efforts of many of my friends who cast a welcoming glance over the initial writings. I owe you all a big debt of thanks. Prolog... Read full Story
Elainetguk 2023-09-06 4,753 Stockings Big Tits Creampie Lingerie Guy Fucks Shemale Mature
0%
A Long Friday Night
Labor Day weekend was coming up. It is the weekend that I let myself go. On this weekend I do something that I save for most of the year. I just do it for myself. This year I was going to try to get a date with a young lady called “Lee”. Let me tell you something’s about me first. ... Read full Story
shemale lover 2012-03-17 3,624 sucking Asian domination jacking off
50%
La pistola NEGRA del Tío, entre Las Bragas de Mi Tía LA PUTONA
Aaayyy.. Yo sabía que la Tía había sido Flor de PUTONA.. pero, jamás me imaginé que me iba a tocar a mí 'hacerme cargo de sus cosas'.. su 'herencia'.. la casa ya vieja, por reordenar destinar y.. LAS COSAS que una descubre ya con los años! Todo estaba igual, pero HORRIBLEMENTE ARRUINADO.. más, e... Read full Story
Ari Riè 2021-06-03 2,003 Teen (18+) Small Tits Crossdresser Latina Bareback Shemale Fucks Guy Fetish blonde Big Cock Uniform Lingerie domination Premium HD
96%
Family Frolic
FRIDAY My sister and her husband wanted to take a few weeks off in the sun and asked me to look after their kids for a while. I'd move out of my tiny apartment and into their house for the duration. As I was still living off my severance and they had a nice spread with an indoor pool and a h... Read full Story
shemale lover 2012-01-14 30,814 strapon porn
0%
The Greatest Lie Part 13
Does Life Imitate Art? I love technology, in spite of the stereotype about girls. Although I was a guy, at least outwardly, until a year ago, I think I was always inwardly a girl. According to the stereotype, we girls are supposed to be indifferent to anything more technical than the designer cov... Read full Story
shemale lover 2012-01-20 4,729 femdom erotic encounters consensual
50%
The Greatest Lie Part 15
I think that if you could get honest answers, a lot of heterosexual guys would probably admit to having had at least a passing desire to be a girl. If they were honest, they would probably admit they thought of it "when I first noticed a girl's breasts" or "when I first felt a girl or... Read full Story
shemale lover 2012-01-20 6,136 anal hardcore erotic encounters fantastic
0%
The Greatest Lie Part 16
As soon as we were safely back in our hooch, I retrieved the iBook from its hiding place under the floor and opened up Spartan's main Excel spreadsheet. I re-sorted the list against the data from the last three weeks of our frustrating field work, by district, language group, age, and every other ca... Read full Story
shemale lover 2012-01-20 4,952 first time femdom crossdressing
80%
Vicky Part 1
"Dear Sir, We recognize you as a person of discerning taste. We would therefore would like to invite you to a display we believe you would find most enjoyable." What followed was an address and a date, one week away. My name and address were correct, but I didn't have a clue what they w... Read full Story
shemale lover 2011-11-14 4,525 sucking cum fingering
75%
Flowers in the Heart
Chapter 1 "Hey Scott, Fauna kind of likes you," Jenna said, snickering. "Hey Jenna, it hard to hear yourself over that echo?" Scott said as he caught the football, and then heaved it back to Ronnie. "Huh?" Jenna asked, puzzled. "Yeah, your head up your ... Read full Story
shemale lover 2012-11-11 10,364 anal tranny Cumshot oral
50%
Growing up CD Part 2
After we left Max, Peter and I fought over who would get to take the magazine home. We decided to tear out some pages so we could have some each. We agreed to catch up the next day and go to his house as his parent were going away for the week. That night after dinner I told mum (dad had left ... Read full Story
shemale lover 2011-12-10 3,684 cum glory hole cd
100%
The Mole
Police work is a paramilitary occupation. Uniforms, rank, weapons, discipline…It can be exciting and interesting for some and boring for others. Some officers seem to find lots of action during their career (or maybe it finds them) while others never use their sidearm except for target practi... Read full Story
shemale lover 2012-01-26 6,443 brunette Crossdresser Fetish
57%
Transsexual Actresses Part 1
The adult entertainment market includes thousands of videos and DVD's featuring transsexual actresses. Some of the more popular of these celebrities have their own web pages. Brief profiles of some of these actresses, including a list of their films, appears after the initial list. Adriana Ventur... Read full Story
shemale lover 2011-09-08 9,164 shemale transsexual porn star
75%
Blue collar Master, white collar slave Part 2
About an hour later I was once again naked except for my chastity pouch and my stilettos and once again I was screaming and crying, my body covered with angry red welts from Master Darren's whip. On my knees crying and begging I held his cock in my hands, trying to give the best handjob ... Read full Story
shemale lover 2012-01-13 11,278 torture extreme fiction bondage and discipline
33%
Duel With the Devil, Chapter 20 of The Greatest Liar
Duel With The Devil This is a work of fiction. All characters (including the narrator), celebrities, places, residences, neighborhoods, restaurants, legal agreements and proceedings, events and incidents are either the products of the author's imagination or used in a fictitious manner. Any r... Read full Story
the greatest liar 2023-07-19 4,053 anal Bareback Creampie Ebony Guy Fucks Shemale post-op celebrity post op sex
100%
Little cock convention
They came from all over the nation to downtown LA convention center. It was the "Little Cock Convention" I watched as men from all races and status came in. Sometimes they came with their wives,friends,Mistresses,lovers, or even their boyfriends. I was on Guard duty and walking the conven... Read full Story
shemale lover 2014-07-07 6,905 shemales hardcore sex humor
87%
Headmistress' Favorite Sport Part 3
There was no more time for Denise and Susanna to get over their chemically induced bout of incestuous activity as Denise was being sent to school. This was of course part of the plan. Slaves should always feel guilty about something and once their slave training was over, neither would be able to ma... Read full Story
shemale lover 2011-12-12 6,210 toys bondage and discipline chastity belt
91%
A New Year's Resolution
I'm not gay (laughing), with that said, I have seen some very good looking, uh, guys. Okay, go ahead and laugh. You see, toward the end of this past summer (August 2011), my wife and I visited an old friend of mine in Pattaya, Chon Buri, Thailand. He's a former Navy Seal. I'm a former Army Ranger as... Read full Story
shemale lover 2012-04-16 7,636 anal sex cum oral sex