Survey like this are about as useful as opinion polls, but there is plenty of evidence that this type of activity is way more socially accepted than it used to be. I know too many "nice" girls who partake, or at least put up, with it.
It may or may not be accurate, but it seems odd that given "critical thinking" as a basic characteristic of conservativism, no one seems inclined to subject the study to critical review before accepting the conclusions.