Hey dude, your finger is enough.
Your prick is even better than your finger, because it is
fatter.
Have you had your first screw?
Your 4" prick has an advantage over the 8" prick because
not all the whole length is in all the time. It goes in and out
remember. The guy with the 8" dick never hit the G-spot, and if he
want to hit the G-spot he has to use his dick like a broom stick.
Thats dangerous because the dick may bend painfully. While you
naturally hit the G-spot all the time and at the same time bang
the clitoris area.
So get over this hangup over size, and learn how to use it.