Why do so many developed and developing nations have such an unhealthy view of human uality?

This view of ual acts and of the naked human body as unclean or shameful has been in our culture for millennia and is likely a byproduct of Abrahamic religions (Judaism, Christianity and Islam, in chronological order of apparition). Now, the strange thing is that it also features in non-Abrahamic cultures, but I'm not the one to know the answer to that...