It is naturally common to get an erection in the penis occasionally while having sex with the partner, but in the case when you fail to get an erection (mostly more than 50% of the time as reports say), then it is gonna be a problem for you which can't be ignored. This problem (Erectile Disorder) mostly develops due to human mistakes. Sometimes erectile disorder can also be an alarming signal of heart-related diseases. Erectile dysfunction (or impotence) is the situation of powerlessness to get and keep an erection firm enough for sex. ED is a very common sexual disorder found in men. But due to ED/Impotence, man may find his life a bit useless. Impotence is actually a sex-related disease and due to this disease, the man fails to get an erection in his genitals (penis) or is unable to retain it.