Joanne
I don't know anything about percentages. But all of the porn that I've seen (not that much) was just generic garbage: bad acting, fake moaning, ridiculously stupid plots... basically, it was intellectually insulting. At least there wasn't any force or violence or urinating, so I guess that means it was regular/vanilla porn.
And I found it SO ANNOYING that the girls would sometimes be looking at the camera instead of the guy doing her. That made it quite obvious that the couple didn't care about each other in even the slightest way.
Add in the fact that there was no compelling story, no love, no intimacy, no affection, no cuddling, no romance, no mutual respect, no history, no future, no giddiness, no nothing. Plus, I thought that all of the guys looked like selfish horny jerk losers.
So there was never any reason for me to ever watch porn again after seeing garbage like that.
Does my assessment of porn mean that I'm a Miss Goody-Goody-Two-Shoes? Not at all!!! My fetish would be considered kinda weird. I'm REALLY excited by taboo love stories (written stories; not videos) of forbidden romance between 100% blood siblings!!!!. But everything has to be loving and consensual. A few example links to some stories are posted below in my comment. If you don't like my answer about taboo love, then just post a "yuck" comment and I'll remove this part of my answer and the comment with the links, too.