A friend-of-a-friend (a bisexual male) raped me a while back.
Got me drunk at a party, slipped me a mickey, did stuff to me while I was under.

I called the cops on him, but because of a lack of physical evidence, there's nothing they can do about it.

I'm pissed, and if the legal system won't do anything about it, I want to do what I can.

What are some ways I can ruin this guy's life as much as humanly possible?

I'd like ways that are legal. I'm not going to jail for this asshole.