I think it's great that you would think about the future story development on the basis of Karder's personality. But I disagree that the urge to dominate would lead him to rape even men.
If we look at rapes in wars in real life, you would hear about women getting raped all the time, but rarely men. I suspect in those rare cases, the perpetrators were into men in the first place. Murder or torture are far more common on men, which is also a form of domination, but not what I'd like to see here.
Nevertheless, thank you for giving us the option to skip gay sex. I'm not offended by it, as in I don't have a problem with other people being gay, but the sight of gay sex disgusts me. Then again, that's just me, and I'm disgusted by a lot of fetishes like anal or pussy licking, which apparently a lot of people are actually turned on by, so I guess I'm not really a standard to go by.
I do hope baby making plays a larger part. It is one of the few physical things the women can pay Karder back for giving him so much trouble. Giving Elvish blood to his babies is truly a wonderful gift, not to mention enlarging his family. They should be milked like cows to get more out of them while they are locked up. I wonder if Karder has tasted Elven or Orcish milk? Such rare commodities must be hard to come by.
On a side note, please consider not beating the women bloody. Personal preference again, but I'm turned off by ugliness, and beating a woman bloody destroys her beauty.