Six to eight inches, hard, is a fairly satisfying size. Of course vaginal size matters too. The tighter the better. This is a matter of preference. But frankly for all of you that say you prefer natural are the first ones to give yourself whiplash when the fake machine guns walk by.
Boobs are boobs.
Some are blessed, some are not. Generally, a woman will not get giddy at having anything inserted into the Hershey highway. That is not a free access area unless she consumes a tremendous amount of liquor and she is near comatose. Gay men provide a lifetime membership to the rectal area. You're selfish to think that it has anything to do with your sex life.