How is premature ejaculation different to impotence or erectile dysfunction?

Premature ejaculation is defined as the inability to adequately control the moment of ejaculation which occurs uncontrolably prior to, during or after penetration.

This problem affects 35% of the male population and is the most common sexual dysfunction in men. In the majority of cases the cause is psychogenic although in some patients hyper-sensitivity in the skin of the penis is to blame. In some cases the cause can be organic.