An abstract from the University of Iowa study says it all.....

University of Iowa Anesthesia Publications

" Effects of chronic marijuana use on testosterone, luteinizing hormone, follicle stimulating hormone, prolactin and cortisol in men and women.

Block RI, Farinpour R, Schlechte JA
To investigate possible effects of chronic marijuana use on reproductive and stress hormones, we assayed testosterone, luteinizing hormone, follicle stimulating hormone, prolactin, and cortisol in 93 men and 56 women with a mean (+/- S.E.) age of 23.5 +/- 0.4 years. Hormone values were compared among groups of subjects stratified according to frequency of marijuana use (frequent, moderate and infrequent; N = 27, 18, and 30, respectively) and non-using controls (N = 74). Chronic marijuana use showed no significant effect on hormone concentrations in either men or women."

To put is simply, no hormone changes = no man boobs, no impotence, etc. Nor will it make your girl a lesbian or a raging nympho. - Granny:hippy: