One out of every four new erectile dysfunction patients is under 40, according to a recent study in the Journal of Sexual Medicine. That's compared to a 2002 Dutch review that found just 2 percent of younger men suffer from ED. What explains this apparent spike in bedroom-related blues? Theories range from higher rates of stress to greater honesty in reporting the issue. But some research suggests your online porn habit may also play a role.This book explores what erectile dysfunction is, how porn might be triggering it in men of all ages and, most importantly, how to treat it.