It is now generally accepted that the roots of our ethics lie in patterns of behavior that evolved among our pre-human ancestors, the social mammals and that we retain within our biological nature elements of these evolved responses. We have learned considerably more about this responses, and we are beginning to to understand how they interact with our capacity to reason.
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Preface To The 2011 edition, p. xiPeter Singer
Woman's reproductive organs are far older than man's and far more highly evolved. Even in the lowest mammals, as well as in woman, the ovaries, uterus, vagina, etc., are similar, indicating that the female reproductive system was one of the first things perfected by nature. On the other hand, the male reproductive organs, the testicles and the penis, vary as much among species and through the course of evolution as does the shape of the foot — from hoof to paw. Apparently, then, the male penis evolved to suit the vagina, not the vagina to suit the penis.
Elizabeth Gould Davis
The impression that infra-human mammals more or less confine themselves to heterosexual activities is a distortion of the fact which appears to have originated in a man-made philosophy, rather than in specific observations of mammalian behavior. Biologists and psychologists who have accepted the doctrine that the only natural function of sex is reproduction, have simply ignored the existence of sexual activity which is not reproductive. They have assumed that heterosexual responses are a part of an animal's innate, "instinctive" equipment, and that all other types of sexual activity represent "perversions" of the "normal instincts". Such interpretations are, however, mystical. They do not originate in our knowledge of the physiology of sexual response (Chapter 15), and can be maintained only if one assumes that sexual function is in some fashion divorced from the physiologic processes which control other functions of the animal body.
Alfred Kinsey
Self-knowledge will reveal the elements of biological human nature from which modern social life proliferated in all its strange forms.
E. O. Wilson
Modern anthropology has taught us, through comparative investigation of so-called primitive cultures, that the social behavior of human beings may differ greatly, depending upon prevailing cultural patterns and the types of organisation which predominate in society. It is on this that those who are striving to improve the lot of man may ground their hopes: human beings are not condemned, because of their biological constitution, to annihilate each other or to be at the mercy of a cruel, self-inflicted fate.
Albert Einstein
Cultural change is the statistical product of the separate behavioral responses of large numbers of human beings who cope as best they can with social existence.
E. O. Wilson
Singer, Peter
Singh, Ajaib
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