I think that as a society/culture we DO have issues with repression, fixation and 'naughtiness' that happen on a far bigger scale than other cultures. Whilst these things may occur elsewhere, it's more in an isolated way than the way we treat sexuality in our society.
In cultures that are otherwise conservative about values you'll find a healthy, ribald humour about sexual matters! It takes you by surprise and then you realise that sexual relations and sex in general is a normalised and taken for granted thing that, whilst still treated coyly, is not considered taboo or 'naughty'...because they have the social maturity to realise sex is the crux of society!
Margaret Mead studied sex in Melanesia and wrote about how liberal-minded the Melanesians were, despite teh Christianisation of the area, and that despite popular opinion, girls were very promiscuous and it was accepted. What she didn't realise was that those people with whom she did her fieldwork were having a complete lend of her! They ARE conservative in their sexual behaviour, but they didn't pretend sex didn't happen, it wasn't hidden or prohibited conversation, so that even the younger kids were 'in on it'.
Anyhow, I managed to use EC principles to get DS night-continent, if that helps