I like your thinking. However, it drags me toward a conclusion that there isn't a 'right' but only a 'coexistence.' The thing of it is, I don't go around talking about my sexcapades, nor do I want to hear about others'. If that makes me a prude, I suggest the world could do with a few more of us!
An autralian historian has put forth the position that much of the hedonistic perception of the ancient world is dead wrong and an mischaracterizaiton of the history.
He says that at one point christian puritans did it in order to facilitate their positions as being better, then the free love movement took it on in order to promote their own hedonistic lifestyles.
His position is that the ancient world was less sexual and depicted human "parts" because that is what happened in those agrarian based societies. (ie statues etc.)