Tried reading Piers Anthony once. Fun writing style but would you call him "erotic" or just "let's not hide away from the fact that human beings are driven by basic desires and bad things happen to good people in space".
Bio of a space tyrant (vol 1) was enough with the refugee pod being repeatedly boarded by pirates by one thing on their mind, and they didn't care who they did it to (at first the women, then the girls, and in some cases, boys)
The War of Powers by Vardeman and Milan could be my first foray into "it's a fantasy novel... oh, hang on..." when the lead female tries to steal from the lead male in chapter one, gets caught by him, cue seduction and sex scene and it just goes on from there!
But would you call that erotic or just "we're using sex as part of the story?"