Hmm. Human sexuality (of any kind - hetero, LGBTIQ+, ace etc.) isn't something I touch in my writing. Not, I hasten to add, because I'm a prude or anything, but because that stuff is intensely personal and private for so many people.
Besides, what business is it of mine, as long as it takes place between consenting adults? As Trudeau (Pierre, not Justin) said when Canada decriminalised homosexuality in the 60s, "Government has no place in the bedrooms of the nation".
The problems arise, of course, when something truly awful is taking place (e.g. rape, child abuse, spousal abuse etc). But these are, again, intensely painful subjects for many people, and I don't want to harm my readers by unintentionally bringing up bad and/or possibly repressed memories.
I've also heard the advice "Don't be judgmental", but sometimes ... OK, often ... this is unavoidable.

Take -- I dunno -- just about any movie made in Hollywood (please). The antagonist (fancy word for villain) always gets his/her comeuppance. Especially in action films. ;P
Why does this happen? 'Cos humanity is vindictive, and loves to see an asshole/bully/whatever get what's coming to him (and sometimes to her). It doesn't happen often enough in real life, but it can happen in fiction, dammit!