One of the most precise summations of size insecurities I've read.
http://www.marriedandhappy.com/blog/...needs-to-know/
This paragraph describes my biggest fear perfectly
"It’s because they have a major desire to give their wife the greatest sexual “pleasure” she has ever felt. They very much want to pleasure their wife to her maximum threshold. In and of its self, this desire and intention is a good thing — but the problem is that they have linked the size of their penis to how much pleasure their wife can feel sexually"