I don't know what the previous ranking it was, to compare, but let's search porn and porno in all the countries:
USA:
http://www.google.com/#hl=en&safe=of...gle.com &fp=1
http://www.google.com/#hl=en&safe=of...gle.co m&fp=1
I see manwin + xnxx/xvideos etc. normal tubes right?
CAnada:
http://www.google.ca/#hl=en&safe=off...ogle.ca& fp=1
http://www.google.ca/#hl=en&safe=off...ogle.ca &fp=1
Canada is funny there are 2 turkish porn tubes?!
UK(GB):
http://www.google.co.uk/#hl=en&safe=...e.co. uk&fp=1
http://www.google.co.uk/#hl=en&safe=...e.co .uk&fp=1
In UK added the BBC site, and again the 2 turkish porn tubes.. they must enjoy traffic...
AUstralia:
http://www.google.com.au/#hl=en&safe....com .au&fp=1
http://www.google.com.au/#hl=en&safe....co m.au&fp=1
Australia is like USA just xhamster more popular.
DE: (Germany):
http://www.google.de/#hl=de&safe=off...oogle.de& fp=
http://www.google.de/#hl=de&safe=off...oogle.de &fp=
German results a little on its own, 4tube, sunporno high, and some german stuff.
FRance:
http://www.google.fr/#hl=fr&safe=off...oogle.fr& fp=
http://www.google.fr/#hl=fr&safe=off...oogle.fr &fp=
In France, FR. host of perfectfirls and FR.* host of pornhubs and other sites quite rule. It seems to really pay to do one host per countrycode.
ITaly:
http://www.google.it/#hl=it&safe=off...oogle.it& fp=
http://www.google.it/#hl=it&safe=off...oogle.it &fp=
Again IT.pornhub ant it.* and some italy only stuff.
NL(Roaldland):
http://www.google.nl/#hl=nl&safe=off...oogle.nl& fp=
http://www.google.nl/#hl=nl&safe=off...oogle.nl &fp=
The "porno" term there brings wikipedias and lots non porn articles, while "porn" is usual tubes.
You can do the same with "sex" etc. and take your conclusions.
It seems to me the change it was very little, the usual tubes are in top, and usual cam sites are in top.
I also checked my traffic from http referers = google.* it seems the same.
Seems a minor update?