In a study group of 52,000 from the Journal Psychology of Men and Masculinity, 45% of men were dissatisfied with the size of their penis and would like it to be larger. This percentage did not change with age, so both younger and older guys felt the same.
The men that believed they had a small penis, were self-conscious, felt unattractive, and often tried to not let their partner see their penis.
The men that believed to have a large penis were more self-confident and felt more attractive.
Interestingly, women who do believe penis size matters more often talked about the width, not the length. A sex coach also stated that a long skinny penis does not give as much pleasure as one fatter and shorter. Bottom line: Size matters – and its Girth.