I can't believe I'm blanking out when I know there are so many more. I'll add to this as I think of them. Here's an m/m one. I've done many pages of rants about "Gay for You" in original fiction. I go with it when it's Jet Mykles, because her characters are often at least intensely curious. Otherwise I'm usually not a fan. In my opinion, it's much better in fan fiction if the characters are at least internally intensely bi-curious. I tend to like it more if they're bisexual to start with, if that can possibly be managed. Perhaps they were previously just very quiet about having a "yen for men."
Oh, and for werewolf stories, the characters howling at climax is a huge cliché. Trust me.
I'm only naming names in this if it's being a fan on my part. I don't even remember most of who's done the clichés, and so many people have done it if it's a cliché that that's the point.
I came up with a recommendation. Josh Lanyon's Man, Oh Man! Writing M/M Fiction for Kinks and Ca$h is a great book for writers.