My son wants to get laid

[Autocratic]

My parents always let me "close the doors" whenever I wanted. My sister had more stringent rules. The fact is, if they want to get it on, they have more options than your house. You're not containing their sexuality or protecting them, you're just overtly sheltering them, and I think you should let go a little. The kids just want to fool around, and they're old enough that they should be able to without parental interference. They're not doing drugs here...let 'em have fun.

Edit: Oh and make sure to give the talk while you explain your new policy. Make him feel like he controls his life just a little more than he does.