The spontaneous out breaking of sexual activity. This can be anything from making out and up. Sexual is usually an off and on thing. One moment you'll be talking to the couple about something and the next they're kissing and then they're back to talking to you. This will happening multiple times during a conversation or social gathering.
"I swear patrick and katie have sexual tourettes. They keep making out at random times in public".
Not being able to control wut you say during sex.
Person 1: Im bout to cum! Ride me in U Crack nasty Son of a bitch!
Person 2: Keep talking.... I like that sexual tourettes!
(or girl) who can't control what they say around the opposite sex.
Girl:"Yeah, I've been trying to shed some pounds at the gym since I've been feeling fat lately." Sexual Tourettes Guy:"I don't think you're fat,I think you're SEXY! Wanna Fuck?" Girl:"FUCK YOU!" +SLAP+ S.T.Guy:"Damn sexual tourettes."