http://www.help-for-ed.com/Impotence-Causes-Can-ED-Be-Prevented-Male-Impotence-Psychological-Impotence.php
First of all, what is impotence in men? Male impotence, or erectile dysfunction, as it is commonly called, can be a total or partial disruption of an erection. A partial disruption of an erection can be something like the erection not being hard enough or not being able to sustain it.