First of all, thanks for the question! It’s so cool to be asked for advice!
As for erotica… oh boy. Well, while I personally have never tried my hand at writing erotica, as a reader, I’ve found that I want enough details to make the scene be distinguishable from any other erotic scene.
One of the biggest problems I have with erotic novels and scenes are that they can focus so much on the what-goes-where of the sex that the feelings and little details that the protagonist notices get lost. I know that as a reader, I personally don’t want to read about the exact details of how sex happens; if I wanted that, I’d look in a textbook. What I DO want are the details that make this character’s sexual encounter unique and interesting, what makes it something that he or she will remember.
Talk about the way the male lead refuses to look her in the eyes, or his penchant for silk sheets. Give us details that make us feel like we’re there and like this erotic scene is too important and unique for our interest to be pulled away by anything else.
So, to answer your question, in terms of the mechanics of sex, don’t stress the details. If your audience is old enough to read erotic novels, then they’re old enough to know how sex works. In terms of the little things that make the story unique to the protagonist, then they are absolutely important. The more of those, the better, in my opinion, so long as they’re relevant to the scene or the story (ie, the two people in the midst of coitus probably shouldn’t start discussing physics for no good reason).
I hope that helps! Message me with any other questions, or if I didn’t quite hit on what you were asking!