Size

It may seem odd to women, but most men have measured their penis at some point.  Am I normal?  Is it big enough?  Comparisons with others are common.

At ‘rest’, the average penis is between 7.5cm and 10.2cm, with a diameter of 3.2 cm.  The size of the rest of him has no bearing on how his penis measures up.
Erect, a penis will usually be between 12cm and 17cm long and nearly 4cm thick.  Length when erect is not proportionate to length when flaccid.