An uncanny ability to sense when people are talking about sex in a room/place near you.
Robert: Dude I was about to fuck her last night so hard.
James : Hell yeah dude!
Ela:Who the hell is talking about me!?
James: How did you knwo?
Ela: I have a sex sense!
when you can sense when anything involving sex is mentioned in a near by conversation
man that skateboarder messed up trying to grind that rail.
*ela walks in and says "what about grinding rails?"
me "ela, you have a fuckin sex sense"