Males secrete oxytocin as well . Males seem to synthesize oxytocin in the same regions of the hypothalamus as in females, and within the testes and perhaps other reproductive tissues. oxytocin can be seen in the males during ejaculation. oxytocin also seems to be involved in facilitating sperm transport within the male reproductive system , having some effect on sexual behavior. Not sure if this helps but im trying to think of its possible uses in bodybuilding, I dont fully understand what you heard about its usage, maybe you can clarify that. The only thing i can remotely think of it being related to Bodybuilding is that it is a Posterior Pituitary Hormone and thus is released by the same mechanism as ADH ( anti-diuertetic hormone) . Maybe you could say what you heard it did and someone can clarify things better.