The truth is, men are not from Mars and women are not from Venus. We are all earthlings whose penises and vaginas came from exactly the same type of fetal tissue. This is why, in addition to penises and vaginas, we also have a wide spectrum of intersex genitals, which medical science is only now slowly coming to accept as 'normal.”― Barbara Carrellas, Urban Tantra: Sacred Sex for the Twenty-First Century