sex-back
When it is so hot you back is coated in sweat, like after sex.
Walking around in this heat has totally given me sex-back.
back sex
Slang for "anal sex", "buttsex", etc.
She won't let me have back sex because she's afraid it will hurt.
go back sex
The act of having sex with your ex after you've broken up.
Kara and I have been broken up since June, but we had some amazing go back sex last night.
horse back sex
When you getting fucking in the booty hole because horses don't have pussys and you get in the position of a horse and you start fucking till your booty hole as big as the horse then you do to the mouth and you make the mouth hole so big that you can fit the horse from your butthole through your mouth
"Bro she's drunk imma try horse back sex with her"