Sure, erectile dysfunction (ED), or the inability to get and maintain an erection for sex, is commonly associated with aging. But the reality is that men in their 20s and 30s can also have ED. A study in the Journal of Sexual Medicine found that 26 percent of men younger than 40 experience ED, with nearly half of these guys noting a severe case, compared with 40 percent of older ED sufferers reporting severe symptoms.

ED affects 8 percent of men in their 20s and 11 percent of men in their 30s, according to research in Translational Andrology and Urology, proving that ED is a young man's condition, too. The researchers found there is an increasing number of men under age 40 who are seeing a doctor for ED.

It's normal for healthy young men to occasionally have trouble getting an erection due to factors such as performance anxiety during sex or drinking too much alcohol. Typically, when a young man has ED