Well, geez...I've been with women from the UK, France, Argentina, Japan, and Korea, and though that's not a huge sampling, I'd just have to say that people are people...and that no nationality is better or worse in bed than any other. If there's anything to this, there may be societal attitudes at play, i.e., one country may be more or less permissive than another, but I think that's about as far as you can go.
However, I will note that:
- the Argentinian was, hands down, the most sensual woman I've ever been with. On top of everything else, she absolutely loved to give handjobs, and would sometimes keep me on edge for 40 minutes or more (yeah, I looked at the clock). And,
- all of the Japanese girls I was with (4 in total) loved to turn their heads to the side and do a little tongue flick up and down the shaft while giving head. It's almost like they all got the same memo.