>>6634
Worth noting that the author of the study in question adds the other result: it seems more attractive males cooperate significantly more in prisoner's dilemma. Appearance, I surmise, doesn't change conditional on cooperation. From this I gather that altruism in self-reports is proxy for abundance and successful, easy life guaranteed by good looks, hence perception of "cheapness" to help out another in a general case.

https://twitter.com/robkhenderson/status/1147186444500426752