This is excellent information on the psychology of sex, especially for the kind of men who actually care about their partners' pleasure. (My advice about the other kind: Don't fuck with them.) Dealing with distractions by avoiding them, planning around them, and protecting her from them. That's golden.

But it's also a good example of how to write about sex in a way that is explicit but not cheap or dehumanizing--a challenge for any writer. You can't leave the bodies and body parts out of the story, but you must focus primarily on what's happening in the mind, on the relationship that makes it mean something. I really got a picture here of two people caring for and about each other, renewing their pleasure bond, and continually building their skills for giving and receiving pleasure.