the study for sure was not balanced and needs 50/50 for men and women, why they would even bother to skew the numbers this way, God knows why

I think it may be because more women suffer from migraines although I may be misrembering that.

do you think women have higher overall pain thresholds, given the whole deal with childbirthing and all that? I have always thought so.

I think women complain less for cultural reasons. Genetics and cultural conditioning are more important than gender in this case IMO.