Common Misconception?

Over the course of the last few months almost all of my girlfriends in serious relationships have confided in me about their husbands/fiancees/boyfriends not wanting sex. They all feel really down that their other half doesn't want to ravish them the way they want to be ravished. And obviously there must be something wrong with them because we all know that dudes just want to have sex. all the time. it's all you hear about from the time you learn what sex is.

is it true?

don't get me wrong, i know boys love sex. who doesn't? but are they really these sex obsessed fiends that just want to get laid 24/7 like we're led to believe? Who started these rumors? And is it causing this distress that my friends are feeling? If a girl doesn't want to have sex, dudes may bitch about it to their friends but it pretty much ends there. I'm pretty sure they don't go to their friend's houses, open a bottle of wine, and get to a point near tears feeling undesirable. But if a dude doesn't want to have sex, clearly that means there's something fundamentally wrong with the relationship.

Now, if these relationships that my friends are in were in the least bit sketchy i wouldn't think twice. obviously there would be something deeper wrong in the relationship and it was just coming out in the bedroom. but these are some of the most functional relationships i've ever seen!

thoughts?