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.

S-E-X by joe November 18, 2003

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s-e-x

1. what porn stars are paid to do
2. what most people like to do for money or for pleasure
3. to fuck
side effects: orgasms babies

i had sex with a really hot chick last night

s-e-x by cameron June 25, 2003

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s.e.x.

a term of when a female has sex for the first time, or loses virginity

i heard she found her s.e.x. last week.

s.e.x. by hustlemoney July 1, 2011

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