Sex at Dawn
is on my list of favorites too.
Ridley's The Red Queen
is a pretty mindblowing take on human sexuality, though I think Ridley was pulling some punches with this one
Anything by Chomsky - Manufacturing Consent
shook me up a bit.
The Ethical Slut
opened my eyes to "polyamory" as a word, and led me to Sex at Dawn, and this forum!
made sex really awkward for me for a while... as soon as I understood that my penis is shaped the way it is so it can scoop other dudes' "deposits" out of vaginas, I just became more anthropological in bed. Awesome book though.
The Master Switch
by Tim Wu - a very timely discourse on the history and state of information empires.
The 4-Hour Workweek
- helped me paint a picture of my ideal future, lit the path a bit
A Short History of Nearly Everything
by Bryson - made me want to buy a telescope and go chill out in some field under a clear sky for a bit.
by Barbach - one of the only erotica books I own. Still haven't finished it though. Not because it's good or anything. But it is good.