6 min read Y OU MIGHT CHALK it up to a stressful work week, an unresolved issue with your partner, or that third tequila shot at happy hour. And that’s okay: Not getting it up from time to time isn't necessarily a cause for concern. But if your failure-to-launch issues are less situational and more of a regular thing, you’re likely experiencing erectile dysfunction (ED). Defined as the inability to attain or maintain an erection “firm” enough for penetration, ED is more common than many people realize, affecting an estimated 30 to 50 million men in the U.S. Though the risk rises with age, younger guys aren’t immune. In one study , over 11 percent of sexually active men, ages 18 to 31, reported having mild erectile dysfunction, while another 3 percent were found to have moderate-to-severe ED.…