Sex you don't want anybody to know about. It has to be kept on the DL because of any number of reasons: you're embarrassed (coyote ugly), you don't want your boss to know, you're a cheating bastard and you don't want to get caught, etc.
"Yo, Smiles, did you hear that Mr. Ed and Toto are having secret sex?"

"No way Ldog, that isn't happening!"

"Oh, don't worry, it is. Apparently, Mr. Ed is afraid his boss will find out. As if Quatals would give a shit!"
by Toridragon July 25, 2006
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When two or more people who are interconnected through mutual social or work acquaintances have sex and one of the sexual partners decides that the sexual encounter must remain secret. Secret sex is damaging to all parties involved.
While sailing the seas of Alaska with my parents, I was experiencing the glory of Secret Sex with the boat help.
by Ruprect July 26, 2006
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When two or more people who are interconnected through mutual social or work acquaintances have sex and one of the sexual partners decides that the sexual encounter must remain secret. Secret sex is damaging to all parties involved.
While sailing the seas of Alaska with my parents, I was experiencing the glory of Secret Sex with the boat help.
by Ruprect July 26, 2006
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v, a verb to describe the act of fucking someone who is clearly asleep in perhaps a drunken stupor. If a guy sticks his 9 inches of midnight man meat in a woman's steak beak while she sleeps he's had a secret sex sesh
Dan slipped his dick in joline while she slept.

He has a secret sex sesh, she thought she had a wet dream....
by The Fairy Sesh Mother August 19, 2021
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Usually refers to the features of a man who has strangely feminine lips. Such features usually make someone look like they keep some kind of vilainous sexploitation secret IE. Sex trafficker, pedophile, rapists or other sexual aggressor.
"You stay over there with your weird secret sex lips."
by Mr B*tchMaker March 14, 2019
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When a group of friends or co-workers draw names out of a hat to decide who has sex with whom at the Christmas party.
I was hoping to draw Susie from accounting for my Secret Santa Sex but I drew Pat from shipping instead. I hope Pat's a girl.
by Gearls December 24, 2008
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