"Am I too small? Am I too large?" - the questions begin in teenage years and, judging by a quick Google search, carry on long into adulthood.
But besides sneaking up to the urinals to take a peek at another man's genitals or broaching the issue in the pub , it's hard to know what to compare yourself to.
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That's why we've created - with our tongues firmly in our cheeks - a handy penis size guide to help you measure your member once and for all.
Note: it only works to scale when on a desktop.
But, despite what the size of the boat school-of-thought would have us believe, bigger isn't necessarily better.
The Authentic Women's Penis Size Preference Chart rates the length:girth ratio of the male member from "ideal" to "not satisfying".
According to the chart, the ideal penis size is between 7.25-8.25inches in length and 6.25-6.5inches in circumference. Quite specific, but hey - us gals have needs.
Anything less than 5inches in length is deemed "not satisfying". The same can be said for penises with circumferences under 4.5inches or more than 7.5inches.