"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. . . ."