"In view of the data which we now have on the incidence and frequency of the homosexual, and in particular on its co-existence with the heterosexual in the lives of a considerable portion of the male population, it is difficult to maintain the view that psychosexual reactions between individuals of the same sex are rare and therefore abnormal or unnatural, or that they constitute within themselves evidence of neuroses or even psychoses. . . . The very general occurrence of the homosexual in ancient Greece, and its wide occurrence today in some cultures in which such activity is not as taboo as it is in our own, suggests that the capacity of an individual to respond erotically to any sort of stimulus, whether it is provided by another person of the same or of the opposite sex, is basic in the species. That patterns of heterosexuality and patterns of homosexuality represent learned behavior which depends, to a considerable degree, upon the mores of the particular culture in which the individual is raised, is a possibility that must be thoroughly considered before there can be any acceptance of the idea that homosexuality is inherited, and that the pattern for each individual is so innately fixed that no modification of it may be expected within his lifetime. . . ."