was able to do this on the Glory but it was hot as AngelaAngel stated. Later in the day is better.
Wasn't comfortable to do so on the 'tops optional deck" due to the gawkers, including some in my own party.
Did go to the nude beach in St. Maarten and went buff for the first time in my life....wow what an experience. I was great and freeing and I am a bit modest. Felt comfrotable even though not at my "ideal weight" since everybody else was "dressed" the same.
There were families out there. Much less "sexual" than I expected. My husband would not drop the swimtrunks, so I did it alone.