In this disorder, males find it difficult to obtain an erection, maintain an erection, and/or achieve past levels of erectile rigidity during sexual intercourse.

Erectile dysfunction disorder, or impotence is the inability to achieve an erection. One main cause of erectile dysfunction is poor blood circulation particularly in the penis. People with blood problems and heart problems are more likely to experience this disorder. People who smoke, drink alcohol and uses drugs are also at risk.

Try and make the question more clear : )

Very hard to understand