Question: what is the average size of a man's private part?
Answer: Using data taken from a number of studies that had looked at 15,521 different men, the study found that the average length of a flaccid penis is 3.6 inches (9.16 cm, and 5.2 inches when stretched and still flaccid) while the average length of an erect penis is 5.2 inches (13.12 cm).