A person (male or female) that you used to date (but no longer do), but still will sleep with you now and again.
See also Imaginary
Ex: "Hey, I know we stopped dating because you're tremendously creepy, but I think we can at least be sex exes, don't you?"
Other person: (No response; tends not to talk to people he's imagining in his head)
by lsiusA August 13, 2011
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An ex-lover with whom you have sex.
I had ex sex with my sex ex the other day.
by Oddsock March 31, 2011
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(v.) To indulge in sexual intercourse with a former partner.
Have some ex sex-you know what she likes!
by Gumba Gumba May 26, 2004
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Is when your dick feels homesick and nostalgic.
Jokes aside, it's one of the easiest kinds of sex to get.
It may ruin your life an get you on the verge of "please come back to me" bullshit. However, it may also make you "whole" and keep you from idealizing the girl (and reflecting over the relationship you used to have)
I tell our mutual friend "say hi from me when you meet her".
5 days later some crazy ex sex happens. It literally takes you next to nothing to grab some ex pussy action.

I gave Jackie a call and we had some ex sex. Why? He knows my body well, those one night standers don't really come close.
by DJ Blowback January 23, 2019
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We've all done it. Sex with an ex.

Usually done after a night of heavy drinking. A follow up of the drunk-dial for a booty call.

Lonely+Drunk= ex-sex
"Can't get warts from her again. I am already carrying that virus. So we decided to have some ex-sex and now she won't leave me alone. I remember why I hated that stanky ho."

"Having a night of ex-sex can lead to a lifetime of hell."
by Stinky McBurr April 20, 2006
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