International Journal of Impotence Research.
But researchers hope the results of a new study, which reveals the average penis length, will reassure many men that they are 'normal.
Each penis is unique and boys develop at different ages and rates.
Do penis enlargement methods work?
Mutations of some Hox genes that control the growth of limbs cause malformed genitalia hand-foot-genital syndrome.
Some people think that the bigger the penis the stronger the sexual pleasure for both.
A systematic review published by Veale et al.