Interesting points to ponder, Alan.

Is sex something we want to see in public or do we want to keep it private? And to what extent? Where do we draw the line? People have varying views on that. The same goes for seeing various parts of the body in public. It's not really so much a moral issue as it is an issue of what people feel comfortable with...or not...and that depends entirely on their own acquired understanding of culture and how they relate to various aspects like sex or nudity.

I agree that there is nothing disgusting about the human body or about sex. However, it might be seen as desirable in many cultures to keep certain bodily and sexual matters private...not on public display.

How do we feel, for example, about someone squatting and emptying their bowels in public or on the TV or whatever? Most of us don't want to see that! ;-) Dogs, however, don't care a hoot about it, it doesn't offend them, so it's not really a moral issue...it's a cultural issue. Cavemen probably didn't care about it either.

It all depends on what you are used to, and what you consider normal permissible public behaviour in YOUR culture. That varies.

At the one extreme you have prudishness and suppression. At the other extreme, you have gross exploitation of humans simply to make money or to create a sensation (which normally makes money!).

Either extreme is a form of social illness.