Studies on testosterone … all point to a simple conclusion. I don't mean to be crude, but it appears that testosterone basically has two, and only two, major drives: fuck it or kill it.
And males are saddled with this biological nightmare almost from day one, a nightmare women can barely imagine (except when they are given testosterone injections for medical purposes, which drives them nuts. As one woman put it, "I can't stop thinking about sex. Please, can't you make this stop?")

Introduction - A Brief History of Everything (1996)