Clan of the Cave Bear had good scenes, but I read that as a teen... Diana Gabaldon's Outlander series is billed as "historical romance", but they are that and much much more. Well-informed, great characters and great erotic scenes.
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I didn't realize this was a book! The movie was pretty fucking hot (Meg Ryan with Mark Ruffalo as a detective...) I don't recall the ending but I'm sure the book's is much more satisfying.
Just realized I'm quoting a 2013 post...

It's been a while, but I do remember bring quite drawn to the Ruffalo/Ryan sex scenes.
Another good one, if I'm remembering the name correctly, is Strangers in the Dark. Rebecca DeMornay and Antonio Banderas star. I need to check the title. It's just a movie, to my knowledge, not a book. But, there's this one scene...
ETA: Wrong title. Correct = Never Talk to Strangers.
Linky: http://m.imdb.com/title/tt0113965/?ref_=m_nmfmd_act_51
Here's one - it's a movie tho - The sailor who fell from grace with the sea. It is based on a Japanese book of the same name, never read it.
The restaurant scene. That's all I'll say about it.