I'm hesitant to say that Tropper's protagonist, Judd Foxman, feels like an authentic representation of how men think - for all I know, that would be like writing that Gone Girl's Amy is an accurate portrayal of how women think - but more than any other book I've read all about a man and his world, it feels close to me.
I mean, of course, it's also fictionalized so take my offering with several grains of salt. Judd is always concerned about the women around him, whether he finds them sexually attractive, whether they might find him sexually attractive, the potential for a relationship with them - sexual or romantic or both - and all mixed in with some non-sexual tender moments and reflections and concerns.
Judd's fantasizing about the people he encounters rings true - at one point he pulls up beside a woman at a red light and imagines their entire relationship all before the light changes. Certainly briefer than most of us do, but a great representation of how many of us flash through fantasies of our possible relationships - romantic or otherwise - the first time we meet someone.
I read this novel when I did primarily because it was recommended and loaned to me by a friend - and came close on the heels of having watched the movie. I do agree with a goodreads friend of mine, Rebecca, in that you may well gain all the humor and familial relationships you may want to encounter from this book by watching the movie instead. But the book is also a lot of fun - crass, sometimes disturbing, with far to many instances of a feared, imaginary prosthesis - but fun nonetheless.