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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

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428
JHO's hair. Used as an adjective to describe one thing so phenomenal that it's almost as good (or is in some cases) as sex.
"Your house is sex."

"Your car is sex on wheels."

"That person's hair is sex."

by JHOsgirl April 10, 2009

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429
Honestly, why would you waste your time looking up sex in the Urban Dictonary.
Almost everyone had health class and should know sex is used for:
-making children
-prostitues
-pleasure
-hornies
-sluts
Sally: Whatchaa doin Lace.
Lacey: Well looking up Sex in the Urban Dictionary
Sally: why you hornbag, we had health
Lacey: Well i though it be easier if i had a full explination
Sally: T.T whatever
Lacey: -clicks- Sex : when a mans penis inserts to a ladys vag.
Sally: ohh wow such description
Lacey: yup, I am looking for the perfect one
Sally: okay then.see you
Lacey: byee<3
3 hours later
Sally: hey lets go to the park
Lacey: 'is on page 29' no thank still lookin
Sally: jeeez. you waste yo time
Lacey: bye
Sally: hoe oh look Sex
by Mooshiee<3 March 28, 2009

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430
sex is when a male and a female of the same species get naked together, and the male puts his penis in the females vagina. then he humps her till he cums.
THE END.
Guy: Lets have sex!
Girl: lets not.
by Dizzydaisy May 30, 2008

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431
the meaning of life.
dude, i had sex last night. i guess i can die happy now.
by zombie fucker May 17, 2008

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432
thing that makes babies.

any baby born is the result of having sex.
billy: i had sex
jane: i had a baby
by baby maker pro April 29, 2008

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433
Everybody's goal in life.
Did you have sex yet?

How about now?
by El-Oh-El October 08, 2007

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434
When a walrus takes your baby and eats it
What the heck i just had sex last night and now i have one less kid
by Steven Baily May 12, 2005

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