@SlayerOfTyranny, since you're coming across as the voice of reason in the manhood101 thread, I have a couple of serious questions for you.
1. You keep talking about masculinity and femininity. How are you defining these terms?
2. Humans can overcome their base natures. It's why most men don't run around raping and killing people, and why I don't break the faces of pedestrians who get in my way when I'm cycling. It's why we've achieved anything as a species.
Given that, what's wrong with breaking out of a dominance-submission dynamic between men and women? Noone is holding a gun to anyone's head and forcing them to behave as equals. If they choose to behave that way, who are you to tell them that it's wrong and unnatural?
3. If a man wants to behave "like a woman" or vice versa, what exactly is wrong with that? Who are they hurting?
I'd also be interested in examples of behaviour that you see as people behaving like the opposite sex.