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
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
The greatest thing on earth.
Would You like to have sex?
Hell yeah!
by masterjhatz May 28, 2008
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
1.(V): act of having sex

2.(Adj): very good thing
1. Tommy: What are you doing later?
Billy: Sexing with my girlfriend.

2. Tommy: How was your night last night?
Billy: Sex
by amoney66 March 17, 2008
When a man's penis comes hard he puts it in a ladys vagina. then the hard penis sneezes milk in the ladys tummy. and after its all done sneezing milk, the penis stops being hard. and then the man looses interest in the lady. this is called sex.
Watch the episode of south park called erection day And you will understand. its about sex and erections. learn it little boys.
by Patrick McLaughlin-Smith October 13, 2006
The best thing ever invented
We had sex it's fucking awesome
by I'm not drunk im intocixated December 20, 2008
Better than heaven.
Sex feels great!
by vaginagirlandpenisboy May 07, 2012

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