Reddit reviews Human Sexuality (5th Edition)

It's actually a fairly common thing to retreat from fantasies once you've experienced them. Sometimes, it's because they didn't live up to your expectations ... other times because you're coming to grips with your "sexual" self and your "normal" self. There's a lot more in this textbook: http://www.amazon.com/Human-Sexuality-Edition-William-Masters/dp/0673467856

There's not much for general "what can go non-standard" with this, a lot of case studies are out there for the specific rarities though. For a good, general primer I would recommend my intro level textbook (mobile so long link, sorry) https://www.amazon.com/Human-Sexuality-5th-William-Masters/dp/0673467856
It's not perfect and has some points I specifically disagree with (mostly with their theories of attraction and how they present fetishes), but it is good.

Edit: I'll clarify my disagreement, they teach a modified version of Kinsey's scale, which isn't wrong but I feel is oversimplified and looks mostly at what a person has done. I ascribe to the tripartied theory of sexuality which means your sexuality is an interaction of three things: what you are physically attracted to, what you WANT to be physically attracted to, and who you can get. This means if you like men's butts, want to be attracted to large muscular chests, but can only get skinny women to date you then you have a legitimate but uncomfortable sexuality that will likely leave you unsatisfied. This also means your sexuality changes over time and based on where you are (hard to pick up women in the men's locker room, easier at a concert).