I think the guys who ask these questions truly live for women. I mean the one and only difference that size makes is that, how well can you please the woman you love. I understand that it's important for men to please the woman they love sexually and otherwise as well, but I think it goes too far when a thing like that is the #1 concern for some men.
Personally this thing has hardly even crossed my mind during my lifetime. When I'm with the woman I love, it will mean very much to me to keep her happy and satisfied on different ways, but if I would be short "down there", I wouldn't think that I've failed as a husband or a boyfriend. People should just focus on more important things in life.

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