I suffered from "yeast" once about 7/8 years ago when I was knocking off some housewife in her late forties. This was back home in UK, but never had any problem with Thai girls and I just love having them wriggling around one the end of my tongue when they start to get really excited !! I am led to believe that it is not common practice amongst Thai couples, so the girls love it when you go down to the honeypot !!
Enjoy
Diz