iOS9 has rolled out and that means new apps and features. iOS9 now features an app called "Find Friends" it's pretty much a tracker and that can mean deep shit for those of y'all who've got a nosy SO or an SO with nosy ass friends or just nosy ass people in your contacts.
I'm not quite sure how it works yet but I'd be cautious with this and turn off my location when going to go bust a nut with someone other than your SO. Better safe than sorry