Forget about ED and premature ejaculation problems for years!
When a man is sexually aroused, the brain releases chemicals that increase the blood flow into the penis. The penis has two erection chambers called corpus cavernosum — these spongy muscle tissues fill with blood and relax during arousal — trapping the blood inside. This causes the penis to become firm and erect.
After orgasm, the brain sends another set of signals telling the muscles in the chambers to contract, releasing the blood back into circulation. This causes the erection to come down.
Erectile dysfunction - commonly known as impotence - is a condition where a man has difficulty achieving or maintaining an erection which is firm enough for successful sexual intercourse!