Showering with my Dad was certainly my first experience of seeing grown up, hairy man penis up close, and couldn't WAIT till I grew up and had something similar. Then, one day, without even really noticing it, I did. As a young adult (I was in college), I did see my Dad with a full on woody, and was surprised that I was quite a bit bigger. Then I did some research and discovered that penis size, which is influenced by a number of factors, but is mostly genetic, is determined, I believe, by your MOM, not your Dad. Interesting, huh? I've always had a secret hankering to see my brother's dick, just to compare, and see who got the better deal. Good thread.