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Are you looking for fiction or nonfiction? On the nonfic side, there's Bisexuality in the Lives of Men. I haven't read it yet, but I just picked it up the other day at a very nice used bookstore. It's a collection of academic research and previously published journal articles on the subject.
Not sure how good or how many insights you work get from his work. Most of Lynn's books fall into what I'd consider to be the 'Romance' category. The first two, Invisible Life and Just as I Am are better than the rest, IMHO.