This year price for bad sex writing in the UK is going to Rowan Somerville. It was interesting to read his explanation: that he was, in fact, trying to express the identity of his characters, as victims of abuse. In fact, it was a bad words management.
In my novel, I avoided too many explicit sex mentions, and one of the reasons was not only the idea of discretion and a certain modesty, but also the lack of experience in dealing with such situations. Maybe the best cure will be to write a couple of scenes and put my words on work somehow.