I haven't noticed any regional differences in what is edgy, but I find it amusing reading about your session having experienced something pretty similar just a month back. I too have a limit on golden showers, but was almost treated to one by my Mistress, who happen to be Czech...

I was lying on the floor tied up tightly when she unfolded some plastic sheets and put them under my head. Then she asked if I was ready for some champagne. She does speak good English, so I could talk myself out of it, though it earned me a couple of extra lashes of her flogger.

I have sessioned with her regularly for two years, so we know each others pretty well, but she simply forgot GS was on my embarrassingly long list of limits. Not a particular favourite on her part either, she thought we hadn't done it before because she never bothered to introduce it.