Pure bull crap. People back then would NEVER have accepted the sexualization of young children. There was innocence back then and people knew it.
My parents used to vacation at the Russian River in California when I was a child. I learned to swim in the Russian River. It was common to see naked 1-2 year olds running around the beaches and in the water. Nobody thought anything of it because it was considered natural and innocent for young children to take off their clothes and run around. Nobody thought of them as sexual creatures. They were little kids.
Today, there would be some perv pedophile creating phone videos for later use.
Society changed and lost its morals. Unclad children were seen with innocence and natural back then. They were certainly NOT sexualized in the 1930s, or 1940s, or 1950s, or 1960s. Not even close.