There's also a simple, chemical reason. Men have 13-16x the testosterone of women, and therefore, 13-16x the sex-drive. Women who take anabolic or other steroids and close this gap suddenly become literal nymphomaniacs, to the point where is is greatly distressing for them.

"Testosterone therapy often results in an increased sex drive and a general increase in self confidence. For women, introduction to exogenous testosterone can also significantly impact psycho-sexual behavior."

Female bodybuilders probably understand men more from a first person perspective than any other woman could.