Penis size sure is a popular subject. It all boils down to two things though;

1) Just like some men prefer a woman to have breasts that are large or small, round or pear shaped, soft or firm, etc. Most women have a similar opinion of the penis. They have a certain "type" that they prefer over others. In the end, however, just as breast size or shape isn't a very good indicator of how good a woman is in bed so too penis size or shape isn't a very good indicator of how good a man is in bed.

2) The penis is a reproductive tool, the size of which is controlled by heredity. If your parents had children it means the penis which planted that sperm in the egg was of sufficient size to do it's job meaning your penis is Ooo-kay. If your parents didn't have any children... then you were adopted and don't have to worry about it because somewhere out there was a penis that had your name on it and it was obviously big enough to get the job done.

-Drake.