Concerning patterns of sexual behavior, a great deal of the thinking done by scientists and laymen alike stems from the assumption that there are persons who are “heterosexual” and persons who are “homosexual,” that these two types represent antitheses in the sexual world, and that there is only an insignificant class of “bisexuals” who occupy an intermediate position between the other groups. It is implied that every individual is innately—inherently—either heterosexual or homosexual. It is further implied that from the time of birth one is fated to be one thing or the other, and that there is little chance for one to change his pattern in the course of a lifetime. It is quite generally believed that one’s preference for a sexual partner of one or the other sex is correlated with various physical and mental qualities, and with the total personality which makes a homosexual male or female physically, psychically, and perhaps spiritually distinct from a heterosexual individual. It is generally thought that these qualities make a homosexual person obvious and recognizable to any one who has a sufficient understanding of such matters. Even psychiatrists discuss “the homosexual personality” and many of them believe that preferences for sexual partners of a particular sex are merely secondary manifestations of something that lies much deeper in the totality of that intangible which they call the personality. . . .
The histories which have been available in the present study make it apparent that the heterosexuality or homosexuality of many individuals is not an all-or-none proposition. It is true that there are persons in the population whose histories are exclusively heterosexual, both in regard to their overt experience and in regard to their psychic reactions. And there are individuals in the population whose histories are exclusively homosexual, both in experience and in psychic reactions. But the record also shows that there is a considerable portion of the population whose members have combined, within their individual histories, both homosexual and heterosexual experience and/or psychic responses. There are some whose heterosexual experiences predominate, there are some whose homosexual experiences predominate, there are some who have had quite equal amounts of both types of experience. . . .
Males do not represent two discrete populations, heterosexual and homosexual. The world is not to be divided into sheep and goats. Not all things are black nor all things white. It is a fundamental of taxonomy that nature rarely deals with discrete categories. Only the human mind invents categories and tries to force facts into separated pigeon-holes. The living world is a continuum in each and every one of its aspects. The sooner we learn this concerning human sexual behavior the sooner we shall reach a sound understanding of the realities of sex. . . .