I worked in our local public library in the reference department. Way too many people came in looking intimidated, scared, apprehensive. In general, their fear seemed linked to their level of education (or interest in education) I can't help thinking that the vast majority of books make it past administrators simply because their lack of interest supercedes actual knowledge. If a book gets flagged by a zealot, who makes complaints to the administrator, the book will get attention and maybe banned because the zealot made a fuss.
I used to live in a small town and got books from the library. I read a novel with an expilicit scene about a woman who was raped by her husband and his male lover. I read another book with explicit scenes of torture in a novel about the slave trade. Believe me, if I had known what was in those books, I would have made other choices. They were otherwise forgettable. Some of my favorite historical novels have explicit scenes, but they are critically acclaimed and well written. I remember the authors and the storylines.
My husband shared with me that he and his friends used to go in that same small library and look at pictures in National Geographic of nude women from cultures that didn't have a dress code. The same library wouldn't subscribe to Playboy. I bet if a zealot found out that the boys were seeing naked women, and horrors! women of color, National Geographic would have been offlimits asap.
Curious minds will find a way. When I was young, I read books I found laying around the house. My parents had a grocery store. For a few years, they stocked paperbacks that were just awful. I got to read several and WOW! They were an education. At least it was good clean fun, compared to later reads that weren't 
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