Sexually Transmitted Emotions: the powerful feelings (e.g., anger, jealousy, possessiveness, romantic love) that almost inevitably develop in at least one sex partner purely as a result of his/her having had sex with the other, and without regard to any agreement they might have that it's "just sex," for example in a friends with benefits situation. Usually referred to as STE's.
Damn, we agreed that we were just friends with benefits, but she musta come down with Sexually Transmitted Emotions 'cause now she's all whacked out just 'cause I fucked Andrea!
by Atlatl August 17, 2006
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