Stories about couples struggling with infertility often feature the woman as the protagonist. But men also face fertility problems. At the Shady Grove facilities, men are part of the infertility problem in 40 to 50 percent of couples who come in, says Gilbert Mottla, a reproductive endocrinologist with Shady Grove in the District of Columbia. “It’s fairly common for us to find both [partners] are contributing to [infertility],” Mottla says. Less common, however, is to find that a man is the sole cause of infertility.