There REALLY IS an App for that! Just when you thought there was an App for everything under the sun, now there is even one for where the sun don't shine!
From Huffington Post:
That's a question that your iPhone can now answer for you, thanks to a new prophylactic suggestion and safe-sex education app called Condom Size. Condom Size's main function is getting an accurate measurement of both the length and girth of the male genitalia in order to identify the best condom for that man. In order to get that measurement, the app asks the man to hold his erect member up against the edge of the iPhone and use the inch or centimeter markings to obtain an accurate lengthwise appraisal: