Christian History and Nudity
Up until the last couple of decades, same-gender nudity was a non-issue among Christians generally. Just look at how restrooms in older Churches were built, as well as shower facilities in older Christian camps. In my own father's time, rural boys didn't HAVE swimsuits. The term skinny-dipping wasn't well known yet. They just called it swimming. But at the same time, boys and girls usually didn't swim together either.