Plasma Testosterone Levels in Heterosexual and Homosexual Men   Richard C. Pillard1, Robert M. Rose1 and Michael Sherwood2 (1) Boston University School of Medicine, Boston, Massachusetts, USA (2) Clinical Instructor in Psychiatry, Harvard Medical School, Boston, Massachusetts, USA   Abstract Plasma testosterone levels were measured in 28 homosexual men and correlated with psychological variables. The overall mean testosterone level for the homosexuals was somewhat lower than for a group of heterosexual controls, but the range of values for the two groups showed considerable overlap. Among the homosexuals, the 13 with some heterosexual experience had higher testosterone levels than the 15 with none.