If you're in a relationship, sometimes you probably feel like you're fighting a caged death-match with an invisible spider monkey. And the monkey is rabid. And you don't have any legs. And then a buffalo jumps in there and starts head-butting everything and your face catches on fire and there is a general atmosphere of chaos. It doesn't have to be this way! Using science, human history and my own experience, I have put together a comprehensive guide for the modern couple on how to ...