If you go to Google Trends and look who (country, language, towns) worldwide leads in googling for the word "sex" you can see some interesting results. It is a pity that Google does not offer the number of WWW-accesses per town/language/country on that site as well.

The first impression is that the more covered the women in a region are the more often the males(?) of that region google for 'sex'.

But of course there are alternative interpretation for why native speakers of the world language English so relatively seldom google for "sex": Whereas nonnative speakers might have no other choice than to start with that three-letter word know in nearly all languages, the native speakers know also some four-letter words in English and so already start with a refined search.

Wolfgang (half serious and with no intention to google trend for the four letter words as well)