I know! Every time I have heard the topic of penis size brought up in ANY conversation, it has been a man mentioning it. Women don't seem to care.
And yes, I agree, complaining about your wife not being "tight" enough is shallow. It doesn't mean sex can't be like it was, it simply means you find different NEW ways of making it as good. Surely that's part of the fun? Experimenting?
As for the whole "she's not as tight anymore because she had kids" caca, that's just selfish. She had a child (or two, or three) for you. If anything you should make her feel appreciated for putting her health and well being on the line for it, not complaining that it has made her "loose". If her "tightness" is that much of an issue for you, would you rather she was "tight" and you didn't have any kids? If it's really that much a case of "one or the other", which one would you rather?