Well, some of my thoughts on rape are in this thread.
http://www.sankakucomplex.com/forums/topic.php?id=6343
Though I think a lot of it is I don't want to identify myself with someone doing something I disapprove of, in this case unjustified harm of the weak. While it's not really a turn on, situations of "bitch deserved it" are quite a bit more tolerable.
Sexual conquest through force is something that's a little exciting, so long as it's not something where you see obvious suffering. Something One of my darker fantasies (should I find a girl interested in that kind of roleplay) is to be bound loosely... escape, then have my way with my captor.
I've recently developed a small taste for tentacle porn, and the thing about it is you get the excitement of force, but I'm not identifying myself with the rapist. I love seeing legs get pryed apart, but I sure as hell don't want to be the one doing it- or feel like I should have some obligation to stop it.