Sex drive linked to amygdala size
Brain size matters for sex. "According to David Reutens at the University of Melbourne, Australia, a person's sex drive may be proportional to the size of their amygdala, a small 'emotion' centre nestled at the base of the brain. The almond-sized nugget has been implicated in sex drive before; it is tickled by erotic movies and is vital for mating behaviour in many animals. But the effect of its size was unclear." (Link snagged from Amygdala, where else.)
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