Also worth taking into consideration is that these studies often ask for volunteers. A man with a larger penis would be more likely to volunteer,as a man with a smaller penis may be too embarrassed to participate. And some studies even allowed the men to measure their own penis. So I believe the actually numbers may be slightly smaller than some of these studies show. I think from what I have read (and it's a lot) that a 5inch circumference penis is on the higher end of average. With 4.5 still being a good fit for most women. If a man were to ask his woman how big around she thought his penis is,she would have no clue and would guess anywhere from 3.5 to 6 inches. Now put the average penis beside a 6 inch circumference dildo and difference is amazing. I know..I'm 5 and look tiny next to a 6. But it's all fun.