In findings that will no doubt make well-endowed millennials rejoice, 8 inches is the optimal penis size when it comes to making women orgasm, according to a survey by dating site Big One. For the most part, survey participants overestimated the average penis size by about half an inch to one inch ( to cm). Of the 10 most widely surveyed countries, only the UK guessed an average size below the real average, estimating that the average erect penis is .
An adult penis with an erect length of less than 7 cm or inches but otherwise formed normally is referred to in a medical context as having the micropenis condition. The condition affects % of men. Some of the identifiable causes are deficiency of pituitary growth hormone or gonadotropins, mild degrees of androgen insensitivity, a variety of genetic syndromes and . A research article notes that most males believe the average length for an erect penis is around centimeters (cm) or 6 inches (in). In fact, .
According to one study published in the British Journal of Urology International (BJUI), the average length of a flaccid penis is inches, while . The girth (circumference) of a flaccid penis and an erect penis average about inches and inches respectively.