“…For example, mood, energy, muscle mass, and strength improve with androgen therapy and might, therefore, contribute indirectly to the observed beneficial effects of androgens on sexual functioning (Grinspoon et al, 2000). Second, the results of basal hormone studies are inconsistent, since men and women with low sex hormone levels do not uniformly report low levels of sexual function (Travison et al, 2006;Santoro et al, 1996;Burger et al, 1995Burger et al, , 1999Burger et al, , 2000Leiblum et al, 2006;Sternbach, 1998;Bachmann et al, 1985;Greendale et al, 1996;Davidson et al, 1983;Vermeulen, 2001). Finally, a substantial proportion of both men and women (30-50%) report no change in libido after medical or surgical castration despite obvious losses of reproductive endocrine function (Bagatell et al, 1994;Bremer, 1959;Dennerstein et al, 1977Dennerstein et al, , 2002Chakravarti et al, 1977;Tauber, 1940;Elit et al, 2001;Madalinska et al, 2005;Zussman et al, 1981).…”