While your commentary doesn't directly have anything to do with sexuality, the wife and I wound up watching a show on the History channel called the History of Sex. In that, they reviewed some of the sexual mores throughout time. It was interesting to see how there were times of particular promiscuity, particularly with the aristocrats of the time, and how the middle class, wanting to distance themselves from what they viewed as immorality, adopted a rather conservative view of sex. This was so apparent that it extended into the medical profession and limited them in their examination of the human body. I found that interesting because, in some cases, you can see that conservative behavior now in reguards to the perceived immorality of homosexuality, something that in various times past, was not considered immoral at all. In parallel, I'm sure that the trend you see towards a 'classless' society is also apparent in this aspect as well, seeing how there has been a slow trend back towards a more open display of sexuality.

In contrast, though, I don't necessarily think this is leading towards a downfall of society or is it any better or worse than the far reach the other way towards conservatism. It reflects a cycle in society, a 'wobble' between being restrictive, prim, and proper and being open, disrespectful, and self rightous. Probably not the best choice of description, but hopefully close. I would imagine that this trend would continue until some major element of society decided that it was enough and pushed back in the other direction.

P.S. This isn't defending those that do what you say, since I find such disrespect deplorable, but simply stating this all as observation.