You really have a great level of empathy and deep understanding of human psychology. As a submissive, I don't really enjoy the pee over me, but it humiliates and reinforces the hierarchy. The act may be repulsive to me, but the effect is arousing. I have no individual desire to submit to water sports, but love the idea of being ****** to endure it. Sometimes in anal sex the pain can be intense. But the lack of ability to resist provides me a very arousing feeling of submission. I love to be so defenseless and selfishly used. The pain is a price I would pay for the pleasure of such use. When my Dom leaves me exhausted, I feel like I have fulfilled my duty.
My experiences on FFM threesomes make me think men have a strong reluctance to any carnal exchange with another man. I have met guys who didn't want to penetrate a pussy in which another man has ejaculated before, etc. Even a double blowjob can be problematic. Two cocks touching in a pleasant way can be 'gay'. I suppose that, for this reason, for a straight man swallowing the sperm of others could be the ultimate humiliation.