"Religious reasons, which is no reason. I notice Skeptic had a review of Dennett's book, Darwin's Dangerous Idea. Religious reasons amount to what Dennett terms "skyhooks." Do you believe in skyhooks? I don't."

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There are many other (besides testosterone) behaviour-eliciting hormones fundamental for humen well-being, including estrogen and progesterone in females. The fact that complex behavioural patterns can be triggered by a tiny concentration of moleculas coursing through the bloodstream, and that different animals of the same species generate different amounts of these hormones, is something worth thinking about when it's time to judge such matters as free will, individual responsibility, and law and order.

— Carl Sagan