"For nearly a century the term homosexual in connection with human behavior has been applied to sexual relations, either overt or psychic, between individuals of the same sex. Derived from the Greek root homo rather than from the Latin word for man, the term emphasizes the sameness of the two individuals who are involved in a sexual relation. The word is, of course, patterned after and intended to represent the antithesis of the word heterosexual, which applies to a relation between individuals of different sexes. . . . It is amazing to observe how many psychologists and psychiatrists have . . . come to believe that homosexual males and females are discretely different from persons who merely have homosexual experience, or who react sometimes to homosexual stimuli. Sometimes such an interpretation allows for only two kinds of males and two kinds of females, namely those who are heterosexual and those who are homosexual. But as subsequent data . . . will show, there is only about half of the male population whose sexual behavior is exclusively heterosexual, and there are a few percent who are exclusively homosexual. Any restriction of the term homosexuality to individuals who are exclusively so demands, logically, that the term heterosexual be applied only to those individuals who are exclusively heterosexual; and this makes no allowance for the nearly half of the population which has had sexual contacts with, or reacted psychically to, individuals of their own as well as of the opposite sex. Actually, of course, one must learn to recognize every combination of heterosexuality and homosexuality in the histories of various individuals. It would encourage clearer thinking on these matters if persons were not characterized as heterosexual or homosexual, but as individuals who have had certain amounts of heterosexual experience and certain amounts of homosexual experience. Instead of using these terms as substantives which stand for persons, or even as adjectives to describe persons, they may better be used to describe the nature of the overt sexual relations, or of the stimuli to which an individual erotically responds."