OK, I'm going to lock this -- it's getting out of hand, and I don't feel like banning anyone today. (Yet.)
The bottom line is that we don't know EXACTLY what Chony did...and given his extreme intoxication, I doubt he does either. "Groping" could be anything from purposeful pawing (bad times) or inappropriate hand placement while trying to get his drunk ass off the floor (par for the course with drunk people). This ain't a courtroom, and it's pointless to argue it anymore.
For what it's worth, I think eggplant is one of our better posters -- the guy is usually damn reasonable. This particular issue has struck a nerve with him for some reason, so I wish people would cut him some slack. I'm sure he has his reasons for being this touchy.
In my opinion, age of consent laws in this country are broken. It's ridiculous to have some arbitrary dividing line between legal and not legal. If a couple has been dating and sexually active all the way through high school, and one day the older of the two happens to turn 16/17/18 (whatever works for your state), then what they've been doing is all of a sudden illegal? And how does a 40-year-old dating an 18-year-old not qualify as child abuse? I think that there ought to be a sliding scale -- you can date someone +/-2 years from your age until you're, say, 21, and after that, you can go do what you want. And, oh yeah, sex before you're 14 should be illegal, period. Play with the numbers until you're happy...I'm not attached to any of them. The point is that kids DO experiment with sex, and as long as they're experimenting with other kids, I don't see the problem.
Finally, to Chony: I forget who gave you the advice, but I agree with talking with the sister first to work things out. If the two of you are cool, then her brother has no business trying to fight you. And, oh yeah, he's a shitty friend -- once you're clear of this, drop him.