It's much more rewarding to rape a man than a woman. Women are easy to rape because not only are they physically weak but they also lack the mental capacity to put up a reasonable fight, which diminishes the actual reward and sentiment of superiority that you're looking for in a rape. This however is sometimes compensated by the fact that their emotional instability and feebleness results in intense breakdowns that manifest through tears, trembling and screaming, all of which trigger positive sexual feedback in the rapist, who feeds upon the woman's helplessness to prolong his excitement.

When raping a man, the act of extinguishing his struggle through your own physical strength stimulates your nervous system for a physical fight, and this has a side effect of exciting the sexual instincts that are programmed into your brain to a great extent due to your increased alertness. On top of that also comes the same mental breakdown as you would get with a woman, which is an added bonus to what already is a far more intense and enjoyable raping experience due to the far more rewarding physical struggle.