Suppose you wanted to show that some attractiveness preference was innate (this requires considerable suspension of disbelief for me, but let’s go with it). What would you do? I know, you’d round up a VAST sample of ‘over 200’ volunteers from a single culture at single point in time, and state that you “suspect the effect to be common across cultures”. I mean, it’s not like there’s any evidence that there’s cultural variation across places and times regarding what is considered attractive. No, not at all. So, if you like this kind of study, you might get convinced that men and women are both innately predisposed to find longer legs more attractive.