Are these same idiot adults the ones who babble on to their daughter of how all bodies and shapes are beautiful?
In some places the nudity is not such a taboo.
Years ago, Life magazine ran an article about Americans playing football (American football, not soccer) in Russia. While the men are in the locker room,the woman who keeps the place clean and tidy goes through. Nobody blinked. (well, I sort of stared at the scene in surprise. Then saw what happened to a former high school gridiron star... He landed in Russia)
Further (the faint of heart should shield their eyes) entire families have been found together on nude beaches in Europe.
Parents have no issues dragging the children to art museums. Photo exhibitions. Both which run a risk of showing nude adults, both male and female.