In a different genre I'm writing a piece in which the male MC (early 30's) has a relationship with a woman in her early 40's. For resonance I'm basing it on a real-world relationship I had some twenty years ago, one so intense and (mostly) enjoyable the memories are still daisy-fresh (and can still make me shiver).
However, my question is - should I describe the sex scenes in the language we used, to maintain the resonance, or modify it for a wider audience?
How would you propose to do that?
When writing sex scenes, I write to please myself, knowing that there's someone out there twisted in the same way I am, who will resonate with it.
The weakness of erotica is that there are so many variations on the sex act and related acrobatics. People are attracted to some and repelled by others, ie, "One person's tender love scene is another person's disgusting squick." What titillates me might put my friend to sleep.
So it's hard to write erotica that's generalized to a wide audience. Plain vanilla, missionary sex scenes have a large enough audience, but there are only so many ways to do Tab A in Slot B. A larger, complex plot is needed to create the emotional environment that makes such a scene interesting.
The market for BDSM is large, because (I think) it lets people stretch their imaginations beyond their own experience. Even so, there's some who won't read it and don't like it if they do. The same goes for other variations and fetishes. It's hard to write scenes that are going to please everyone.