
I think it's because of rape kink. And I think cheating kink isn't so popular. If it is popular at all.
Also a lot of people is more and more aware and aren't too happy about rape too.

I think a lot of people don't understand the psychological effects of rape, and have had rape justified and downplayed so much by media figures, reporting, and people in their lives that they no longer have any perspective on the difference between normal consensual sex and rape. I can't count how many times I've seen comments like "they felt good at the end anyway" or "he was in love so it's okay" or "they asked for it" on here. People just don't get it.
Also, I think a lot of the commenters here are very young, so they may yet have some growing up to do.
funny how people get so f*cking mad about cheating in yaoi but just let rape slide huh? I see... (cheat is never ok btw)