I watched a vid many years ago called 'Closet Queens' where a man in makeup and drag was fucked by another guy and he kept crying and calling out to his 'daddy', then taking the cock so far down his throat he started to gag. I found it a complete turn off. I've watched many types of porn over the years, still do, but there are limits where it goes beyond erotic and just looks sad.
I was much younger when I saw Linda Lovelace with a German Shephard and it totally creeped me out. Watching her suck the dog and then letting it mount her is forever etched into my brain