OP might not have been the brightest crayon in the box (part A of his FML is receiving a LOT of attention, with good reason): the internet long ago taught us that you don't stick it in crazy. And most of us would agree that his motivations are less than laudable. HOWEVER, saying 'YDI' is not right, people. The list of conditions where someone deserves the crap beaten out of them does NOT include having done something stupid to get sex, nor does it being shallow enough to date someone just for sex. OP may not be the most sympathetic victim, and it IS tempting to see this as Karma taking her pound of flesh, but the fact is that he's landed himself in a situation that, no, he didn't really deserve. Full disclosure, I DID click 'YDI' before thinking this one out a bit more fully.

So...how was the sex?

You know what they say, crazy in the head, wild in the bed. But all of the drama and bullshit out of the bed isn't worth it.

Known physco? Ouch! Dating her because she is potentially great in bed? Guys like you just want something to stick your dick into. I don't feel bad for you.

"Men can't be abused!" -Feminism

That you ever actually believed that dating a woman you think is a nut job would result in good sex and not complete bedlam shows you should not kill anymore brain cells with alcohol

Crazy chicks are great in bed, but that's something you're supposed to rent, not buy.

No one can drive you to alcoholism. It's a choice you make.

Apparently abuse against a man is fine if he got into a relationship for reasons that you find unsuitable.