I hope this is okay! A few years ago (10+ years) I read a strange erotic novel. The man character was a married man, he stumbled across a strange sex group. Involving some kind of supernatural being that when it touches your forehead, you experience incredible sexual pleasure. It gets weirder and it’s very detailed. It has been my first and only erotic novel I have read. I found it at a Salvation Army of all places.
Source: reddit.com/r/eroticliterature/comments/5nzygx/help_me_find_this_book_possible_spoilers