Erectile dysfunction or impotence is the inability of a man to achieve or maintain an erection, sufficient for his partner’s sexual needs. These men have a decreased libido or sexual desire that could be due to either aging factors or maybe something else. Physical or psychological stimulation or arousal results in significant blood flow to the penis. The arteries in the penis supply blood to the erectile tissue which becomes engaged and expands as a result of the increased blood flow and pressure. Erectile dysfunction usually occurs due to decreased blood flow to the penis and/or nerve damage causing frustration or physiological issue with the person who suffers from this.