When someone is particularly attractive. Derived from the popular Kings of Leon song "Sex on Fire".
Damn, her sex is on fire.
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Like the icing on the cake, something happens to improve something else massively
see also sex is not on fire
-At this party tonight... remember I said Ben wasn't going?
-Aye
-Well now he is
-Sex Is On FIRE!!!
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When sex is really really good.
Man, this is good. This is sex on FIRE.
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A Very AMAZING kings of leon song
of there new album (L)
"yeahhh, your sex is on fire"
Boy: Omg Have You Heard Sex on Fire
Girl: Yeah Sex On Fire Is A Awsome Track Of KOL's New Album
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Guy: I was with this girl last night, SEX ON FIRE!
Doctor: Yeah, you've got gonorrhea.
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When a girl with a UTI infection has sex...
(girl with uti infection): i had sex last nite... it was sex on fire
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some fool's idea of a synonym for the word cool.
Baby, you're so awesome, you're sex on fire.
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