Human penises vary in size on a number of measures, including length and circumference when flaccid and erect. Besides the natural variability of human penises in general, there are factors that lead to minor variations in a particular male, such as the level of arousal , time of day, room temperature, anxiety level, sport activity and frequency of sexual activity. Compared to other primates, including large examples such as the gorilla, the human penis is thickest, both in absolute terms and relative to the rest of the body. Measurements vary, with studies that rely on self-measurement reporting a significantly higher average than those with a health professional measuring. As of [update] , a systematic review of 15, men, and the best research to date on the topic, as the subjects were measured by health professionals, rather than self-measured, has concluded that the average length of an erect human penis is Most human penis growth occurs between infancy and the age of five, and between about one year after the onset of puberty and, at latest, approximately 17 years of age.

Science has actually studied penis size—here's what is considered normal. Does penis size matter? Sex experts typically say no, but that doesn't stop a guy from worrying that his penis might be too small. Amazingly, scientists have poured their resources into measuring male members—and they've come up with an average penis length and width.

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Back to Sexual health. Men everywhere worry that their penis is smaller than it should be or that it won't satisfy a lover. But research suggests that most men underestimate the size of their pride and joy. Man has always placed great importance on the size of his penis.