Also,the major social media companies are rather prudish. Want to post a selfie from the beach? You better be covered up!

That's actually a good point, the ToS of American companies (and FCC policy) are based on what is, probably, a (prude, christian) minority, imposed on all Americans; and with their dominance over "social" media these rules are imposed on even more people.

I wouldn't be too sure about that minority: http://www.pewresearch.org/fact-tank/2016/11/14/if-the-u-s-h...

And the data on sexting shows that it's very much a minority of Americans who send/receive nudes: http://www.pewinternet.org/2010/10/23/teens-adults-and-sexti...