The male libido is always in overdrive, right? Wrong -- one out of five men actually have a low sex drive Men. High sex drive. Panting sexual animals. We know what they want. And we know when they want it: right now. Even doctors tend to see men as "sexual automatons," hardwired always to want sex, says pioneering sex researcher Irwin Goldstein, MD, director of sexual medicine at San Diego’s Alvarado Hospital and editor in chief of The Journal of Sexual Medicine . "But that is not the case at all," Goldstein tells WebMD Magazine . "Many, many men -- about one in five --have such low sexual desire they’d rather do almost anything else than have sex." One in five men doesn't want sex? How can that be true? And why haven't we heard about it? Actually, many women have -- the ones hearing the phrase "Not tonight, dear." Goldstein says most people think that is a rare occurrence. "But in fact, almost 30% of women say they have m