I am a woman, I've not spent any serious time in a men's locker room, but I did see the difference between the boy's and girl's version in high school, as you note, we had curtains, they didn't. I've seen college locker rooms, pro teams when the cameras go in to show us pre-game stuff, some after-game footage, I have never ever seen curtains or partitions of any kind in a men's locker room -- once upon a time I cleaned restrooms, I noted the ladies stalls had doors on them, the mens, nope, urinal right there as well.
In any kind of privacy discussion with my brothers, husband now, when I was younger I would ask them, "How can you just do that in front of other guys? Doesn't it bother you?" I have been told men/boys don't notice, don't look, there's no modesty question. Accepted -- and that is why this business of Massa and the lack of curtains in the House gym, I didn't understand the big deal he was making. Now, Rahm strolling in, literally butt nekkid, the poking a finger in the chest, to me that kind of power trip move, I wouldn't put past Rahm, but don't men walk around nekkid in locker rooms all the time? In full view of each other?? Is that really something that needs to be pointed out as so out of the ordinary??
My question to him, okay, I understand that, but then how many men's rooms, locker rooms, etc., has Massa been in since leaving the Navy, such that he still would expect shower curtains in the House gym?
Neither of us can answer each other -- but it would help the conversation, at any rate.