ok Ill admit it, I read to page 4 and had to type this. *pardon me If this already got covered between there and here*
Most of you are looking at this all wrong.
99% of DF players would probably agree that beating a mother to death with the leg of her only daughter would be horrible, and would not condone it. However, when you are in combat in DF and something like this happens 99% of us would say "ewww, that was gross and disturbingly hilarious." There is no special reward, or a goal, to do something like this, thus no intention of promoting this. Instead it is a byprouct of the flexibility of the game.
Same with rape. 99% of us would never condone it or even like it done to anyone. However, if it happened, not due to our actions, or in spite of us, It helps to contrast the good and evil and thus provides a richer world. As such the only way that I see of adding it and be proper, would be to have it "so and so forced him/her self onto so and so in a horrible and reprehensible act and created the ofspring so and so." That is emergent and does not condone the acts. I don't think this should be a thing we could do in adventure mode, just like we cannot get married in adventure mode, or have offspring. (Just how adventurous is that anyways?) Yet if Rape were possiable (as such it could be recognized by the system) and you wanded into a town and stumbled upon the duke's son attempting to force himself onto some poor farmers beutiful daughter, you could do two things, Stop it or let it proced. you could gain the wrath of the dukes son, the duke himself, the farmer, or al of the above depending on how yo used the games systems to approach the situation. Slay the dukes son? tell the Duke? Stop the son by non lethal means? kill the farmers daughter? All of these would have pros, cons, and unforseable consequences. You might become a hero to the townsfolk and a wanted criminal inthe lands. Or a despised coward and crony for the crown.
In essence it is not the act that should or should not be implemented/discussed. Rather it is the way that it is handled/portrayed.