I'm reading these posts and I'm getting the same hints that I get from people who don't like romance: you're not able to say the difference between reality and fiction. And really, if a children under 7 stumble over an erotica or killing books, I blame their fathers who allow it, no Amazon. And, perhaps, there's a cathegory for religion but, if I'm looking for title, "Love" appears in a lot of religious title... and I'm not looking for that.
BTW, if somebody expects BDSM in "Moon is a harsh mistress" is going to be a bit disappointd, the same than in "50 shades of grey"