When a man develops an erectile dysfunction (ED), he basically develops impairment with his erection capabilities. The problem with being erectile impaired is that it prevents a man from successfully engaging in sexual intercourse – one with full vaginal penetration. This is because a penile erection is needed to fully vaginally penetrate the female. If the sexual contact does not involve any vaginal penetration, then it is not a full sexual intercourse. This erection condition was a big problem in the past as there were no real effective means of treating the condition. These days, the best way to treat penile impotence is through PDE5 inhibitors like tadalafil generic.