I think it gives me confidence, knowing that given the opportunity, I could sexually please most women. I think women can sense that and they show it, and that fuels the confidence. my wife, before marriage, told me she was so happy that I am fairly large. she said it was what sealed the deal, that she wanted to marry me. she told me she looked for 3 things in a guy. nice looking, good attitude and sense of humor, and hopefully a bigger than average cock, but it not, it was not that important. she said, she was attracted to me because I'm am(or was,much older now) good looking, easy to talk to, smart, and an off beat sense of humor that kept her laughing. we fucked on the 3rd date, and she told me later she knew she had found her man.
I also liked the surprised response friom the ladies finding a fat cock on a skinny guy. it ranged from "oh,my", "mmmmmm", to a gasp. my wife gasped and said "big and fat".