Why does it have to be satisfying? Why can't it be awkward, frustrating, weird, silly, disgusting, unnerving, brutal, repulsive, anxious, conflicting, mean... unsatisfying?
Sex scene is just like any other scenes -- why the expectations? Why can't it be what it is? A part of the story. Why must a death scene be sad? Or a wedding scene be lovely? Just like any scenes: Show vs. tell. You can, of course, always fade to black and then describe it late using any one of those vague adjectives, or you can guide your readers through the experience and make them feel awkward, frustrated, weird, silly, disgusted, etc. But a sex scene, like any other scenes, must serve a purpose. Or you can skip it completely if it doesn't serve any purpose.
I don't understand the qualms about sex scenes because, I mean, do you have a problem with writing death scenes? How your antagonist gets it bad in the end? How about scenes where the characters beat the shit out of each other? Do you have a problem with that as well? To me, sex scene is just like any other scenes, albeit it could be more difficult to do well. But people who have a problem writing or reading sex scenes -- I have a feeling they have a problem with talking about sex in general.
So that's not a story problem. But a problem with the author. As for the readers: if you build it, they will come (so to speak). Those who won't read your book for whatever reasons, won't anyway.