The Average Penis Size - How you Measure up...
It has been my experience a lot of people want to say it is 4-5 inches... But that is an out right lie - The average length of a penis is in fact 6.5 inches long by 4.7 inches around in girth.
HISTORY 101...
Humans as warm blooded critter go have the largest penis to body ratio among mammals on this planet, the reason for this is women in the past - actually picked their mates (when they could) by penis size! Now some girls do like to be dominated, manhandled and such but that comes from the dominate males who could force women to have sex with them (genetic memory is a fascinating subject if you have the time).
This is why men tend to come in two forms skinny with a big dick, and very strong with a little dick - ones ancestors where picked because sex with them felt good, the other was picked as they where good providers/hunters - or had the strength to take from women what they wanted - sad but true, for this is our past.