(NSFW) I need some good examples of historical erotica? (details!)

Ok, I’m trying to convince a friend to give historical erotica a chance. But she says she doesn’t like it because she “usually get(s) caught up in limits of the times and lack of outward vulgarity.”

We need to prove her wrong. So what I need is basically the dirtiest, most vulgar erotica you can point me in the direction of.

Thank you, and please, get yourself a towel and a cigarette before getting too far into this search ;)