Sorry, iPhone users! While the "Predicktor" app will supposedly estimate the size of a man's —  ahem — naughty bits, it's only available on Android devices right now.

(Yes, this app seriously exists. And yes, a doctor actually helped create it.)

More details:
http://www.androidpolice.com/2013/02/06/the-predicktor-will-allegedly-predict-penis-size-based-on-your-butt-size-and-other-very-personal-info/
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