Ahhhh, this exists! An app which lets you meticulously track your sexual encounters by GPS location, position, and whether or not you used protection. (Sort of like a real GoodReads for Sex app?)
The worst part, though, is that it lets you see who else in the neighborhood has also just had sex.
No, no, I'm sorry, the worst worst part is the app's name: "I Just Made Love." That is the worst part.