Rather than someone just saying "indian women are freaks in bed" or the like, the person should also list the nationalities he has experienced with, or else the survey answers don't mean much.
You would still get a pretty meaningless response because people would just straight up lie. Like the rule of 3, divide whatever number a guy gives you by 3 to get the real number and multiply a girls number by 3.
A better examination of this topic would be to watch a culture's porn. The more fricked up awesome the porn, the better the culture.