He hadn't seen much porn, but he was damn sure the way to instant sexual success wasn't becoming a plumber or a pool technician.
He also manages to describe sex in words appropriate to whoever is the Point Of View character at the time, so we get
rubbing her through her jeans
where the first "her" stands in for a more explicit description, through to the use of words like "fuck" and "penis". He does it beautifully.
I have to say that I find scenes which use indirect words can be very erotic, as a misplaced "clitoris" can pull me right out of the story. I need the characters to speak in their own voices, otherwise it sounds like a visit to the clinic.
I think I said much the same thing about the use of strong language generally. Is that the secret of good writing: get into your character's heads?