“A Mind of It’s Own: a cultural history of the penis”, by David Friedman
Everything you wanted to know about never thought to ask about the thing. One shouldn’t be surprised that even way back in time, there was mysticism about it. One might even think people are obsessed with it, but I am not, of course.
One thing I’ve realized over time (not just from this book) is that Freud was always an idiot.