@Gargron Nice summary and open access pdf: mdpi.com/2076-2615/10/6/1007 The methodology is quite... unconvincing. Most obviously, their material consist of 4 pictures of 2 ~20yo guys, and their surveyors are recruited from Mechanical Turk who did surveys for ¢50 (so probably very poor young women, possibly disinterested in rigourously answering questions). Can't comment on the findings as this is not my discipline and IDK the literature but the experiment has no legs.