In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.

An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
lets have sex...... : D
by adfasdgfslgjjgerpgrei August 01, 2008

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when a man inserts his penis into a woman's vagina
man:lets have sex
by tom_cass August 10, 2005

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the spaceship goes into the port which then goes up and down and white fluid is released from the ship. a latex sheild is sometimes used when a ship is being attacked.
some peoples ship with never set sail.
by Steve-O February 22, 2005

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A wonderful time in which a naked women strips down and rubs her body against a naked man's, the man will get horny and get an erection then the women lays down, bends over, lays on a table, sits on the man, bends backward or leans against a wall and the man proceeds to push his erecton into the female's vagina continuously, causing her immense pleasure. She begins to moan and screem until the man and women reach orgasm wich in which the man ejaculates and the chick fuckin screams with PLESA!
When they had sex they had a good time
by Derek H February 27, 2005

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When two people really love each other, they try their hardest to make each other happy!
“Hey, I’m Home” I say as I walk down to the kitchen of my apartment to my roommate Chris. His dark, slightly curly hair appears around the wall that separates the living room and the kitchen.
“Welcome back. What did you get up too?” He asks and I see the rest of his head. His face is a lovely olive and his eyes a magnificent green.
“Can’t I have an secrets?” I ask, as I am slightly ashamed of my whereabouts 30 minutes ago.
“Come on Belle, I’m your best mate, it cant be that embarrassing, don’t you trust me any more?” He asks as he comes out of the living room looking impossibly handsome in a dark t-shirt and mid denim jeans.
“Alright fine… I got a wax…” I say looking down at my skirt. I had hoped of keeping it a secret but as my best friend Chris knows I am not very good at keep secrets especially not from him!
“Wow I never thought you would get one! That’s cool. Well can I have an exam?” He asks. I have secretly always had a thing for him but I decided it was best if we just kept being friends.
Astonished by his request I took a step back and with an attempt to control my tone I asked: “why would you want to look at it and no you may not!” Secretly I wanted to show him, but that was out of the question.
“Well you obviously got it done for someone and I merely want to check the quality of it. Is that a bad reason? Plus come on I’m your best friend.” He asked with a cute expression on his face which read ‘Trust me, you know you can!’
“No!” I say as I walk down to the bathroom and as I shut the door I feel guilty that I said no to my one desire and to a face as gorgeous as his!

I shrug it off and de clothe and hope into the shower, as that is what the lady told me too. As I washing my body I hear the bathroom door open.
“Go away” I tell Chris.
“Too late” He says as he opens the door and I see the most wonderful body in the world! It is toned and it is olive and it is strong, masculine and big! And that is not just his body!
“Well, she did do a good job.” He says with a naughty little smile on his face as he kneels down to face my newly waxed pubic area.
“What are you…” I start but soon stop as his mouth starts kissing me. I suddenly start to feel even more wet. Then his lips part and his tongue starts licking my vagina. He is so good; his tongue is roaming my entire vagina hitting my clit multiple times a minute. I feel my knees buckle and soon I feel a pressure building up inside. As he hits my clit one more time I have my first ever orgasm and it feels brilliant. My knees then buckle completely and I land in his arms. That is when we kiss for the 1st time and it is magic. His tongue roams my entire mouth the way he did to my vagina.
Then I pull away about to ask why he is doing this when he brings me back for more kissing. Then I feel something start to stand up behind my back. I pull away once more but this time I make sure he can read my eyes.

I stand up and move down so that I can repay the favour he had just given me. I lower myself so I am sitting naked on his thighs. Then I start to rug his 9-inch penis and I can feel it harden instantly. Then I start to lower my lips to it but stop right before I am able to kiss it. Instead I move my lips to the side and start kissing his testicles. He shivers. Eventually I can’t stand it any more. I place his dick in my mouth and start sucking it like crazy! I can feel him shiver and moan with pleasure. Then I start licking while I suck. Soon I feel the pressure break and hot seamen races into my mouth. Then I move my moth away and his dick is spraying my neck and chest with seamen, but the water from the shower washes me quickly. I then move my body up and then my lips find his lips again and we start kissing again. He roles me over with care in the shower. His moist lips part with mine and start traveling down my body when I stop him.
“No, more kissing.” I say breathlessly and his lips return. Then his arms come around my back and brings me closer and my arms go around his back and starts messaging his back.
Then his lips part mine again.
“Come on” He says to me.

He steps up wobbly then turns off the shower than leans back down and assists me up then he quickly opens the door and then embraces me and lifts me up and rests me on his hips then subsides into my kissing again. We walk to his bedroom and he places me carefully onto his bed and then pushes me up so that my head is on his pillows. While still kissing me incredibly he reaches into the top draw in his bedside table and pulls out a condom. Quickly he puts it on himself then he enters me. Pushing himself slowly in and out. I start to shiver in joy. Then I feel metal on my wrists. I stop kissing him for a moment.

“Let me take charge of your pleasure, if you ever want me to stop then just say so, but please try it with me.” He says and ends with a little kiss.
“Alright” I agree just wanting to kiss him more.
He starts penetrating himself again inside me, but then speeds up, faster, harder he pushes.
Then we both explode into orgasms again. I feel his hot seamen and my hot cum mixing and we take a moment to pause from kissing and then he lowers his mouth to my neck and starts moving it down towards my pulsing vagina. He gives me oral again and it is even better than the first. Once he has finished with me again he moves again up.
As he releases my restraints I quickly roll him over and cuff him to the bed.
“My turn” I say and then I start rubbing his dick with one hand and rubbing my vagina with the other. I see his mouth start to drool as I bring both him and myself to orgasms again. I stop rubbing myself when I feel ready to burst. I then take my hand which is feeling very wet and I start rubbing it along his face then, while still rubbing his hardened cock I start licking his face. Once I feel satisfied with his hardened cock I mount him and we start having more sex.
Again we orgasm. Then I release his restraints and then I collapse on his heaving chest.

“I have waited so long for that, man Chris, I love you.” I admit
“I love you too Belle.” He says as he rolls sideways and then turns me around and we lie facing each other like I had dreamt for the past 4 years.
We just lay there in each other’s arms soaking wet from the shower talking. When we finally start falling asleep we prove to each other how much we love each other one more time to be sure.
by MissRatty December 21, 2007

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when a guy sticks his hard dick into a womens wet vagina
Dinner was nice and they flirted like usual. Putt Putt was fun too. Joe spent more time watching Jessica's sexy body as she leaned forward to hit the ball. Her long sexy legs looked so firm and silky and her dress fluttered playfully in the breeze as it seemed to dance against her curves.

The drive home was spent laughing and talking about their game. "I have a bottle of wine at my house." Joe said softly.

"Is that so?" she said in a sexy voice.

"Mm hmm." he said back.

"What else do you have at your house?" she asked driving him crazy with her sultry tone.

"Would you like to see?" he asked.

"Only if you want me to see it." she said putting her hand on his thigh.

Holy shit! She had never touched him before. He knew it would be a piece of cake to get laid tonight. They went in his house and he gave her a glass of wine as he gave her the tour of his house. She seemed very impressed by his house and by the time they had gone through every room, the bottle of wine was empty. Joe opened another bottle.

Jessica was giggling more and more as they went out on the patio. "Wow, you have a pool too?" she said filling her glass again. "And a hot tub" Joe added putting his arm around her and gently turning her towards it. "Very nice." she said turning towards him. They stared at each other in the moonlight and then slowly began to kiss.

Joe put his arms around her and pulled her closer to him pressing his hardon against her as they kissed. Jessica moaned as she felt his hands caress her ass. Joe slid his hands under her skirt and felt her soft tight ass cheeks. "Mmm," he moaned feeling naked flesh. "No panties?"

Jessica pulled away from him and slowly took off her dress. He couldn't believe she was standing in front of him with nothing on but a thong. "Yes panties." she said giggling. "No bra." she said as she took his hand and walked to the hot tub.

"Oh God!" he said as she slid off her thong and slowly got in the hot tub. "Are you gonna join me?" she said in a sexy voice.

Joe got undressed and his cock stood proudly erect as he got in. Jessica stopped him before he got all the way in. He sat on the top step of the ladder as she gave him a long sensual blowjob. He could feel her hard nipples rubbing on his legs as she went down on him. He couldn't believe she was sucking him off! "cum in my mouth" he heard her say over and over again as she massaged his balls. He shot his load in her mouth and watched her swallow his every drop.

She stood up and kissed him pressing her wet plump tits against him. She pulled him into the water with her and drank another glass of wine. They kissed and made out heavily as she straddled him pressing her tits in his face while she rubbed her pussy all over his cock.

Joe spent a long time sucking her nipples and groping her plump, round titties. They got out of the tub and wrapped up in a towel. Jessica went to the bathroom and then came out to find Joe waiting for her.

"I want to fuck you so bad!" Jessica said rubbing his cock through his towel. Joe led her to his bedroom and she layed on his bed. She spread her legs and began to rub her pussy and play with her nipples. "I bet you wanna see me make myself cum." she said as she rubbed her clit. "I know it will turn you on." she said slowly sliding a finger inside herself. "Look how wet you make me." she said as she continued to masturbate for him.

Joe's cock was throbbing. "Stop!" he said suddenly.

"Ohhh...I can't." she said rubbing her pussy harder.

Joe put his head between her legs and moved her hand. He slowly slid two fingers inside her as he licked her clit. She let out a load moan as he fingered her wet pussy. His tongue danced on her clit as she began to cum. "Oh yeah...Oh Joe." she said as she gushed hot juices from her cunt.

Joe pulled out his finger and licked up her cum and then plowed his cock inside her tight hole. He fucked her hard and slow as his cock throbbed even more. He felt his balls get tight and knew he was about to cum. "Should I get some protection?" he whispered in her ear and began kissing her neck. "Oh my God Joe," she moaned grabbing his ass. "your cock is so big!" Joe had to stop so he didn't cum. His cock throbbed wildly inside her as he held his breath.

"Jessica," he panted. "do I need to get a rubber?" he said starting to fuck her again.

"I'm on the pill," she said raising her hips to meet his thrusts. "rub my pussy with your cock before you cum inside me." she begged.

Joe pulled out and began rubbing her clit with the tip of his cock. She began to moan and squirm under him as he made her cum again. "Fuck me hard Joe!" she said letting out a load moan as he rammed his cock inside her. He shoved her legs up higher and fucked her harder and harder.

"Oh God yes!" he moaned over and over as she tightened up her pussy on his cock. "Oh my God Jessica!" he said as he shot his load inside her. She clawed his back as he rammed her deeper and deeper until he was satisfied and finished cumming.

He felt his cock shrinking and twitching inside of her as he kissed her neck and ear. "You are so fucking beautiful, girl." he said as he pulled out and kissed her chest working his way down to her nipples where he spent a few minutes sucking them. He kissed her stomach and made his way to her freshly fucked pussy and slowly licked her slit. He could taste her cum and his and he slid in three fingers and began to finger fuck her again.

It wasn't long before he was hard again and this time she got on top of him and rode him like a whore. Her tits bounced up and down as she glided up and down on his cock. Jessica rocked back to meet his thrusts as she screamed louder and louder. Joe came in her again and then they collapsed on the bed.

They got dressed after a few minutes and he drove her home. She gave him a blowjob on the way. He couldn't believe what a horny little slut she was. He walked her to the door and gave her a goodbye kiss. She had her one tit flopped out of her dress for him to touch again.

She opened her door and pulled him inside quickly. Before he knew it, his cock was out of his pants and they were on the floor fucking again. Her door was barely closed and she was naked laying on her back as he gave it to her one more time. Joe zipped up his pants and helped her up. Jessica kissed him as she stood naked in the doorway.

"Let's go out again sometime soon ok?" she said closing her eyes as Joe rolled her nipples in his fingers and thumb.

"Yeah, like real soon." he said kissing her neck.
by shannon365 September 20, 2008

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Sex is like math:

You add the bed,
Subtract the clothes,
Divide the legs,
And pray you don't multiply.
Guy 1 to guy 2: Sarah and I were remembering high school math in bed last night when we had sex. We went at it like wild monkeys!
by (v.j.o) March 27, 2008

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The lone reason why the world exists, figuratively, and literaly!!!
Why Is Sex Like Riding A Bike?

1. You have to keep pumping if you want to get anywhere.

2. It's best to wear protective head-gear when going into unfamiliar territory.

3. You can do it with no hands, but it's best not to try it until you have a lot of experience.

4. It's easier to learn with the help of someone who has a lot of experience.

5. You can do it by yourself, but it's usually not as much fun.

6. It's usually hard to control your speed the first few times you try.

7. It's best to have a soft place to land.

8. You don't need any special clothing, but you can get some if you are really into it.

9. If you're with someone who is having trouble keeping up, it's usually best to slow down and wait for them.

10. Most people think it looks easy until they try it for the first time.

11. Once you learn, you never forget how.

12. If you fall off get right back on.

13. If you get a flat, try pumping it back up.

14. Remember to signal before you change direction.

15. Make sure that you've got a firm grip.

16. Once you're over the top, you can just coast the rest of the way.

17. That's why some of them are called Mountin' Bikes.
by DGlaze March 21, 2007

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