There is a limit to what we can do with the bodies our gene pool gave us.
Some are hairy, some are not.
Some tan easily, some burn at the first look at the sun.
Some people can't help weight problems.
I think it's all about politeness in a larger society. Me. I'd just as soon slap those young lovlies showing off their bods when I have to look at my aging one in my cabin mirror.
But I do cover it up when I am "around the ship."
And I will admit to look at the younger guys with the six-pack abs as Queeg's six-pack abs mean something else.
I REPEAT, it is about politness.
My opinion is that around the pool it's a free-for-all and if you don't like what you see, look the other way. Other places, it's in poor taste.