For those of you who believe in God this might offend you, or you might find it comical. For those of you like me who don't, this is just comical.
Ok. So my theory is that "God" punishes people who take part in sexual activities (not necessarily sex, but BJs, fingering...etc.) with acne. I've noticed that the goody-goody little boys and girls who do know wrong and don't even know what clitoris means have no acne whatsoever. BUT the people who have girlfriends/boyfriends and 'play around' with them, often have acne.
I myself have a small amount of acne, (You know what that means =D) and use ProAtcive to try and control it. I have a friend who I know has had sex, and does often, and his face is completely broken out all the time.
Although this isn't a real theory, I found it a funny thing to think about.