Studies of the body-build of homosexual patients have produced conflicting reports. Weil (1924), in Germany, reported that homosexuals had a narrower biacromial diameter and a wider intertrochanteric diameter than a control group had. The latter unfortunately was obtained from a different part of the country and measured by a different observer. Wortis (1937) could lind no abnormality in the body-build of homosexuals. Sheldon (1949) found there are no distinctive features of homosexual physique recognizable from a somato typing photograph. He states, however, that the majority of homosexuals are recognizable by what he terms secondary gynandromorphy?that is, "the measures of the femininity of the face, hands, skin, and skin appendages ; manner of movement and co-ordination ; voice and facial behaviour ; in short, the covert gynandromorphy that escapes the photograph." This is in agreement with the common clinical impression that the effeminate appearance that many male homosexuals show is the result of mannerisms of gait and dress affected consciously or unconsciously by the subject rather than due to any abnormality of body-build. The present investigation was undertaken to determine whether homosexuals have an abnormal discriminant androgyny score?an index of body-build ?which, as is shown below, is related to the sexual development of the individual. The discriminant androgyny score (Tanner, 1951, 1955) of a patient is obtained by measuring the biacromial and bi-iliac diameters and substituting in the following formula: 3 x biacromial 1 x bi-iliac diameters (in cm.)