Just finished The Male Brain by Louann Brizendine.
I was very surprised at how much I liked this book and how good it was. I can't remember who recommended it or why I picked it up because it's not the sort of thing I would have normally read.
I particularly enjoyed the section about the teenage male brain. Finally I don't feel so guilty about the way that I behaved when I was a teenager, I was wired to behave that way.
I believe that the male brain is a sequel to The Female Brain which I have not read and I'm not sure if you need to read it after reading The Male Brain. I say this because at every stage of life she compares and contrasts the male brain to the female brain so you're really learning about both and their differences.
At the end of the day the reason why we act the way that we do is because we have these chemicals marinating our brains and pushing us back towards the stone age man.