The general plot of the movie revolves around prostitution, but there are no sex scenes. Mostly just explicit dialogue and some pictures of topless women.
A man throws his feces onto another man's face early in the movie (and then this is mentioned repeatedly throughout the rest of the movie), and later a boy that has been lobotomized wets himself.
While it isn't violence between partners, a lot of the violence in this movie is centered around violence by men against women. Specifically, violence towards sex workers from their clients.
No, but there is a lot of head bashing with hammers, chisels, fists, etc. Most (all?) of the deaths in the movie are from blunt force trauma to the head.