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
a boy putting his penis in a gals vagina
did u see when i licked that gal on that vagina when we had sex.
by bag of coal February 13, 2008
something i could never stop thinking about
I really wanna have SEX some of the girls in my school...
by The Chariot October 20, 2007
good and fun
I'm waiting til college to have sex, that's when girls look the best.
by KiLLBoDiEs3066 May 01, 2010
something your to young or old to do
mom:your too young to have sex
by ;alskd April 15, 2009
When two or more individuals engage in an act which brings pleasure and desire to all participants and can leave all parties wanting more.
A man and woman, man and man, woman and woman or collection greater than two of men and women please each other sexually.
by JessT April 08, 2008
The act of a man inserting his penis into a woman's vagina for sexual pleasure. Usually resulting into the woman being pregnant, unless contraception is used.
Boy: Let's have sex
Girl: Sure! But only if we use protection
by The Real Namer April 02, 2013
something hank will never experience
me: "Hank you get laid yet?"

hank: "No girl wants to have sex with me"

me: "of course not..."
by kozlow September 04, 2008

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