The two classes of androgynes do not mix well. Just as the full-fledged man is averse to attendance at a ladies’ sewing-circle. Particularly the mildly androgynous fear suspicion of their secret if they associated with ultra-androgynes. Coteries of ultra-androgynes naturally form. Knowing their own nature, they readily recognize one another, although down to 1921 at least, the sexually full-fledged have usually been blind to the androgynism of daily associates, because they were never permitted to learn of their existence. (6) PSEUDO-HERMAPHRODITES are humans possessing in part both the male and the female genitalia, or else organs so deformed that even sexologists are unable to determine the sex until puberty. In half such cases, the physician then pronounces the individual to belong to the sex other than that with which he or she has identified him or herself. As a rule, they subsequently live and clothe themselves per prescription. But some, accustomed to the dress and usages of their first sex, choose to identify themselves with it throughout life. Pseudo-hermaphrodites are the limit toward which the ultra-androgynous approach by slight gradations. Their frequency is not greater than one in a million to ten million humans. (7) FULL HUMAN HERMAPHRODITES—possessing both complete male and complete female genitalia—have never been encountered. There exists in medical annals, however, a pseudo-hermaphrodite who so nearly approached full hermaphrodism that at one period he-she claimed to have lived as husband and father, [Sidenote: _The Sex Scale._] and at a later, as wife and mother. This reputed transposition is in accord with the observed phenomenon[8] of an individual’s passing over from one sex class to another at the climacteric corresponding to menopause in woman. * * * * * I have a theory that the sex class of an individual male depends on the size, but particularly the vigor, of his physical reproductive apparatus. I have ascertained such variety to be practically infinite, and psychicly as well as physically. There exist no sharp dividing lines among the six classes of males. While the bulk of a particular class correspond closely to the description, there are individuals on each side of such mode who constitute slight gradations over to the next class. Thus each class gradually and almost imperceptibly shades off into the next. There exists indeed a sex scale along which all human beings can be theoretically arranged. At one pole stands the tremendously virile man—for example, the rough volunteer common soldier, as a rule intensely polygamous; at the other the petite, cry-baby species of woman. Androgynes and gynanders occupy exactly the middle section, looking toward both the male and the female side.