I feel even sillier, I thought it was about men having babies and whether saying man was correct or not, then it went all locker room talk.
I'l share a locker room with anyone,
if my kids saw genitalia so what?
I would suggest that we would be a healthier society if we didn't have this obsession with acting like sexual organs/the stuff we pee out of, are something to be ashamed about.
grow up society.
I understand your position, but let me explain why the "locker room talk" is germane to the question of whether or not a man just had a baby.
If we treat men and women equally, if we never draw a distinction, if sex really doesn't matter in any situation*, then it really doesn't matter whether we call someone a man or a woman anyway. Ok. So Mr. Mom is really a man. So what?
As long as there is no practical difference in the way we deal with men and women, then in it really doesn't matter whether someone is a man or a woman.
However, there's the thing. We really do care whether someone is a man or a woman. We care socially, and in a few cases, we bring that care into law and policy. So the "locker room" stuff is just illustrating that, whether or not it is rational or wise to do so, most people care who sees them naked and, specifically, whether those people are men or women. It's just an illustration of one circumstance where most, but not all, people care about the difference between men and women.
*And I'm excluding individual romantic/sexual preferences. That's something where darned near everyone cares one way or another, but that's between the two, or more, people who are trying to work that out between themselves.
ETA: In other words, there is the philosophical question of what truly makes one a man or a woman, but that's not a question most people really care about. The reason it becomes a political issue, or an issue worthy of societal debate, is that certain people not traditionally viewed as women wish to be recognized as and treated like women.