For what its worth.... the biggest cock Ive ever had was attached to a black man. The smallest cock Ive ever had was attached to a .... wait for it.... black man.
While size does play a role, I consider it a minor factor. Skill is the key! the large dick I mentioned, He was to busy being impressed with himself to do much for me. The guy with the small dick knew it and made every effort to see that I enjoyed myself. Sorry if I burst any bubbles!