What is the required size of penis to satisfy the women?

Here are some ...: Known to most, if not to all, penile size is not the sole factor to satisfy women's sex life; penile growth comes to a halt after marching into adulthood roughly at 18 for men. What is its normal size? Many studies on penile length reported a wide range among men from different continents even in the same race: its erect length, in US, 12.9 cm; in UK, 14-16 cm. In my impression, it's 9-13 cm.