Erectile dysfunction (ED), also known as impotence, is the inability to acquire and maintain an erect penis.  ED is a very common condition, particularly in older men where it is estimated half of all men between the ages of 40 and 70 suffer from ED to some degree.  ED is linked to many causes, such as psychological, hormonal and vascular factors.  Genetic factors are also … Continue reading First genetic risk factor for erectile dysfunction identified.