I agree with HarryT (ooh, a rhyme).
Something to always consider is what kind of impact certain materials will have upon the intended audience. Fans, not the casual perusers, of historical fiction are most likely going to have a solid fact base and probably an interest in history. Contradicting something along those lines will do exactly what an author wants to avoid: break the illusion and take them out of the experience at a minimum. Worse, it might make the reader angry.
Heh, that's kind of funny about the sex scene, though. I suppose people considering Ye Olde Englishe types of settings don't expect much besides a Puritanical approach to sex? Eh, who knows?