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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
44 44
When the penis goes up into the vagina letting sperm find the eggs often causing pregnancy. Sex usually happens in the closet or anywhere when people from the opposite sex or same sex are "horny" see horny for detials.
erwin dreams of having sex.
by joe November 18, 2003
320 149
To have an organism with a man and woman, man and man, woman and woman. You could also endure a three-some, when three people of the man or woman genders pleasure each other by their cock/dick, pussy/vagina.
Jordan walked home into her apartment one night. She had only one roommate, who's name was Amy. Amy had only been living with Jordan for about a week. Jordan knew about now that when she came from work, Amy was at the bar, or at a sex addict meeting. But weirdly, the television in one of the bedrooms was blaring with some late night porn. As she neared the room, she heard a moaning. Opening the door, she found Amy fully naked in the dark, stroking her pussy with a bottle of beer in her hand. It seemed that alot of beer bottles were on the floor. She took the bottle from Amy and put it to her lips, and it tasted like cum!

"Baby, save some of that action for me." Jordan cooed, turning around to put away her briefcase and to change.

"No, bitch." Amy immediately responded, getting up from the bed. She took the back of Jordan's blouse and turned her around, kissing her lips.

Jordan parted her lips to french Amy, and they played around with their tongues. Finally, Amy pushed Jordan to the door, though they still frenched each other.

Jordan responded with an, "Ugh?!", while Amy slowly unbuttoned the blouse. Jordan's black lace bra was taken off, and even the skirt slid to the floor. All Jordan was wearing was a lace thong.

"Been waitin' for me, huh, Jori?" Amy said when they stopped kissing.

"Mhmmm." Then, Amy started kissing down her body, licking around her nipple once she got to her boobs. Jordan started moaning, and when Amy took off her thong, she started moaning louder because Amy flicked Jordan's clit with her tongue.

Jordan soon got into an orgasim, when Amy thrusted her tongue into her vagina, squeezing the clit with her fingers.

"Oh my God!" she had yelled, but Amy stopped. She stood back up, smirking. Winking, she went back to her small dresser and took out a pair of cuffs and lubricant, and also a vibrating dildo.

Amy cuffed Jordan to the bedpost, and put the lubricant and dildo next to her. Amy then started dancing seducely, masturbating herself while doing so. The television was still on.

She was rubbing her clit, while caressing her left boob.

"Aghh! Give me some of that you damn, fucking whore!" Jordan yelled, struggling against the cuffs. Smiling, Amy walked slowly, with her boobs bouncing, to a beer bottled and poured it down Jordan's throat.

Amy smiled, then fingered Jordan. Then used three fingers, then four, then her whole fist. "Damn, bitch, you're so damn wet!'

Jordan smiled. "I know, babe. And it's all because of you."

Amy grinned, taking her hand out splattered with cum. She licked her hand once, and smiled. "Delicious, babe." she said, then thrust her hand into Jordan's mouth. "You're cum is so tasty Jordan."

Amy then took the vibrating dildo and stuck it inside of Jordan's still-wet vagina. She licked her asshole while pushing and pulling the vibrating dildo.

"Oh my.." Jordan screamed, moving wildly from the hotness in her body. Amy grinned as Jordan cummed, but didn't stop. Intstead, she took her other hand and started stroking her own wet pussy.

Then, an hour later, Amy stopped and readjusted the cuffs lower. Then put herself on top of Jordan, lowering her pussy to her mouth.

They started a 69er, the heat rising up in the room. Finally, after two hours, they both had cummed inside each other's mouth, and were sleeping drunk beside each other, their nipples rubbing against each other.

And after that, every night when both of them were home, they did the same thing.
by kinkyfreak:) June 23, 2009
263 102
10% Luck
20% Skill
15% Concentrated Viagra Pills
5% Pleasure
50% Pain

100% Reason not to get married.
"Attention students: According to a national survey, Sex is considered to be physical activity. The Sex varsity team will be taking tryouts tomorrow from 3:30 pm to 12:00 am. That is all."
by tellziitlikeitizz November 01, 2008
511 352
An activity that involves stimulating the genitals, and in theory is pleasurable for at least one of the people involved. The most obvious example of this is when a dick is inserted into a pussy, pulled part way out, then pushed back in, and repeated several times until the man empties his balls or has his dick go limp because he either had too much to drink or not enough. However, there are countless variations, including anal sex, oral sex, gay sex, a gang bang, a hand job, a titty job, a etc. Also sex can be done by any number of people.

It is difficult to make a clear distinction between what is having sex and what is just fooling around or foreplay, or something else, and different people generally have different ideas about what is and isn't sex. For example, former President Bill Clinton believes that sex is not sex when it is done between the President of the United States and his intern, or perhaps any member of the White House staff, we don't know for sure.

Most species of plants and animals use sex as a means of reproduction, and sex has had a vital role in the evolution of most plants and animals.
The front page story of the New York times was pretty good this morning. They had all the details, the president's intern started coming on to him. He had some really important work to do, but said fuck it, I really could use a break right now! So first he stuck his hand up her dress and finger-fucked her til she squirted all over his hand, then she deep throated him and when her tits were all messy with her slobber she gave him a titty job, then he fucked the shit out of her and jizzed all over her dress. But it's not sex because that new law says that sex is only defined as something that people other than politicians and their staff do.
by Woody Alien September 23, 2011
384 243
In the exact words of my ancient Shaolin Master:

"Sex is the most fun you can have without laughing."

by Sparrisen September 18, 2008
273 133
an art in which a man has to be more expierienced then a woman for it to be good. A male usually reaches his point of orgasm 3X faster then a woman so it takes alot of concentration and it has to be in the right position to. If sex is in the doggy style position then it is less pleasurable for the man and more for the woman(believe me fella's thats actually a good thing). In which case if the men and women are both at the same sexual level it is more likely that they will orgasm at the same time.
Sex is actually harder then you think
by ScottieIsTheNextAntiChrist September 03, 2006
380 245
Face it, the only reason that you're looking up sex right now is so that you can get horny from people's definitions.
Bro, I just looked up sex on urban dictionary. It was so much better than porn.
by sex:) July 19, 2012
192 55