Yes, I agree that Dworkin equates coercive sex and penetrative sex. If Dworkin thinks that understanding rules out male rape victims (female tool use, to say nothing of homosexual rape), that would make me sad. After all, male tool use on females would be coercive according to her.

Edit: Forgot central point, which is that saying "men can't be raped" is very different from saying "male rape victims don't matter" The first is an argument about definition and perspective. The second blatantly contradicts the assertion that rape is wrong.

At a certain level, I think it is right to say sex is generally coercive, in much the same way that going to work is generally coercive. If you don't go to work for a long enough period of time, you will be the subject of violence. (e.g. eviction)

That understanding of coercion has the twin failings of (1) not being the ordinary usage of the word, and (2) not saying much that is interesting. Everything is Dworkin-coercive, just about.