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If this is the case, then there are various physical or psychological causes that can be looked at.
The primary cause of erectile dysfunction is linked to old age with the following chart detailing just how significant this is.
An erection is stopped when the muscles in the penis contract.
The tunica contracts and opens up the channels for draining blood.
Erectile Dysfunction (ED) - also referred to as impotence - is estimated to affect around half of UK men at some point in their lives.
The erection process starts with mental or sensory stimulation that causes arousal.
When this happens, impulses are sent from the brain to local nerves to instruct the muscles around the corpora cavernosum to relax and allow blood flow in through the penile artery so that the penis expands.
The deoxygenated blood is then carried away via the deep dorsal veins and the penis becomes flaccid. Whilst both fall under male sexual dysfunction, they are separate conditions.
Impotence is the inability to achieve or sustain an erection after arousal, whilst premature ejaculation occurs when a man can achieve/sustain an erection, but reaches orgasm before a satisfactory duration.