Need to be more scientific, girl, lol.
According to science, it's all in the fingers. They say that having an index finger that is shorter than the ring finger means having a bigger penis. The bigger the difference, the bigger it is. The explanation is that the index finger length tells you how much female hormone the man was exposed to before being born.
Less female hormone = shorter index finger = bigger penis.
Here's an article about this if you're interested:
http://healthland.time.com/2011/07/0...f-his-fingers/