Or their senior girlfriends, if they are under 18. A boy could have sex on his 18th birthday with his girlfriend who was born the day after him, and be a child molester in some states. Or vice versa, for that matter. I don't think there is much support for a death penalty in such a case.
I am all in favor of hanging true child molesters, but by that I mean adults who have sex with pre-pubescent children.
-ccm