How can i increase the size of my penis, and what minimum length is required to satisfy a woman?

Different parents: The only way would have been to be born to different parents w/different genetics. Be satisfied with what you have; it's much better than none at all. Remember, it;s not how big but how well you use it. If you need a doctor, see a psychologist to find out why you feel your inferiority is due to your impression of a small penis. There is no minimum. Any penis will do just fine, even yours.