There are a number of books which I am uncomfortable with, sometimes it is the subject matter, sometimes the language. There seems to be a tendency these days for many books to add a large number of swear words - which (except in a few cases where it may be in context) should never be acceptable.
The problems with erotica is that some of it is so disgusting that it should not be put in print, however as people become more and more exposed to it they become immune to it.
I would not say that I am a prude as such, however my views have not changed much over the years, but it would seem that other people's views have, and things which would not have been acceptable at all a number of years ago, seem to be almost normal now.
There should be a degree of self censorship by the authors themselves, and this type of book should only be available to people who are actively looking for it, and not show up in general searches for everyone else.