The size of the flaccid penis (a penis without an erection) varies among men and there is no minimum size. Many factors, like cold, can affect the size of a flaccid penis and some men have a naturally smaller penis. A smaller penis does not affect the ability to perform sexually.
During sexual arousal, the penis will enlarge as blood fills the area and should become fully erect. Some men experience an incomplete or weak erection and this may affect sexual intercourse. Another problem is a partial erection which is quickly lost and the penis returns to a flaccid state. These problems are known as erectile dysfunction or commonly referred to as impotence, and requires medical investigation and treatment.
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