Well, from my conversations, I can state the following:

A big cock can be great.

A small cock can be great.

A guy who has a big cock can be a great lover.

A guy who has a small cock can be a great lover.

A guy who has been told he has a big cock and lets it go to his head can end up as a lazy and selfish lover.

Ultimately, know your strengths and weaknesses, and give your partner what they want, and very infrequently will there be cause for dissappointment.

And if that doesn't work, get your receipt, return your partner, and keep shopping for a new one. Life is too short to waste time on the ungrateful and the unpleasant.

Jim