Obviously this is an individual issue for some people, and not an issue for others. I can make broad sweeping statements in response but they won't be right for everyone, but there are several issues that really seem to pop related to this problem.
1. Why are they desiring the 20 somethings instead of their own wife?
2. Do they understand what it is that makes their wife feel loved?
3. Are they expecting her to take the initiative?
4. Are they communicating their needs to their wives, and more importantly, listening to their wives' needs and fulfilling them?
Basically, they most likely need to man up. That doesn't mean forcing sex on your wife. It means ignoring the 20 somethings and focusing on your wife, it means putting her needs ahead of your own, it means taking the initiative to communicate (ask about what she needs FIRST!) and remembering that you are tied to this person, to be closer to this person than any other person for the rest of your life. Start acting like it.
If there are kids in the picture, sometimes women feel weird about sex with kids in the house, or at least more inhibited. Be willing to put a lock on the door or whatever it is you need to make her feel safe.
And, maybe perhaps most important of all, is love and be there for your children. How can you expect a woman to respect you if you don't take care of, and love, your children together as much as she does?
Maybe they are wimps, but not in the way it read here. A wimp is the guy who wants the benefits without the responsibilities. A real man takes responsibility, leads courageously, rejects passivity, and expects the reward for it all in the afterlife, not in the present life.
Thanks for the article!