sex is on fire 

When someone is particularly attractive. Derived from the popular Kings of Leon song "Sex on Fire".

Damn, her sex is on fire.

sex is on fire by caibzlin7Q February 25, 2009

Sex Is On Fire 

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!!!

Sex Is On Fire by Sharn March 4, 2009