Inlay

It's a bit related to this: perhaps this arises because there's a constant focus on the mechanical act of PIV that needs to be described in new and exciting ways instead of, idk, pulling out a toy. You can ameliorate this by focusing on the emotions, vibes, but switching it up helps a lot more!

Writing opinions that may get you shot: I get that it's a bit of an in-joke now, but the idea of NEEDING a long list of synonyms for genitalia if you're writing erotica is so... If you're referring to them so much you need a dozen different words, you're probably writing the sex scene wrong.