My theory is that it's a way for them to emotionally cope with men who are otherwise too unmanly. He has to reassert himself in the bedroom, or something.
Discussion
So, if the only place where he's leading is the bedroom, then he has to be almost ridiculously dominant.
Personally, I think alot of men of the past two generations have become overly concerned with appeasing everyone. This has led to alot of them becoming very effeminate in some ways. Many seem to have forgotten or are scared to be assertive.
You can be simultaneously assertive and respectful. I'm not sure many understand that as well as they think.
