Shut the fuck up.  Really?   You want me to give you the obvious answer?  It's because girls don't like a small penis and the larger it is the better off you are in life.  It has evolutionary advantages.  But really it's because  this community  called me out and asked me to post nudes after accusing me of being fat and having a small dick.  So I said fuck it and posted the pics to prove them wrong. The size of my dick is important because it disproves their claims. So in this context the importance of my dick size is to win the argument.    Now if you're asking what the general importance of dick size is it's because it's evolutionarily benefital.  You people are dumb man.