"From the department of duh", как говорит один мой знакомый:
For men, arousal almost always leads to desire. So by improving a man's ability to have erections, Viagra measurably affects his sexual function. But arousal and desire are often disconnected in women, the researchers found, to their consternation.
Although Viagra can indeed create the outward signs of arousal in many women, that seems to have little effect on a woman's willingness, or desire, to have sex, the researchers said.
"There's a disconnect in many women between genital changes and mental changes," said Mitra Boolel, leader of Pfizer's sex research team. "This disconnect does not exist in men. Men consistently get erections in the presence of naked women and want to have sex. With women, things depend on a myriad of factors."