“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.”
Sexual Behavior in the Human Female (1953)
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Alfred Kinsey 12
American scientist (1894–1956) 1894–1956Related quotes

“I am an actively heterosexual woman who celebrates however people want to express their sexuality.”
On having liberal approach about sex — Evening Standard "Gillian Anderson: Self destruction is my default mode" http://www.standard.co.uk/showbiz/celebrity-news/gillian-anderson-self-destruction-is-my-default-mode-9897489.html/ (December 2, 2014)
2010s

Source: Feminism, Marxism, Method, and the State: An Agenda for Theory (1982) Signs Vol. 7, No.3, p. 533
The Satanic Bible (1969)
As Halley continues: 'The resulting class of heterosexuals is a default class, home to those who have not fallen out of it.'
Source: Straight with a Twist (2000), p. 28.

September 1874, Popular Science Monthly Vol. 5, Article: The Alleged Antagonism Between Growth and Reproduction , p. 608
The Alleged Antagonism Between Growth and Reproduction (1874)
"Scientific ideologies in change: Fear of Homosexuality as an Intellectual Event," from The repressed sexes: Historical texts and commentaries on homosexuality, ed. J.S. Hohmann (Lollar: Achenbach, 1977), pp. 129-44