Actual study Patterns of Paternal Investment Predict Cross-Cultural Variation in Jealous Response Scelza, B, Prall, S, Blumenfield, T, Crittenden, A, Gurven, M, Kline, M, Koster, J, Kushnick, G, Mattison, S, Pillworth, E, Shenk, M, Starweather, K, Stieglitz, J, Sum, C-Y, Yamaguchi, K and McElreath, R https://www.nature.com/articles/s41562-019-0654-y.epdf They looked at a bunch of primitive societies in africa, asia, central america, as well as some modern urban populations. Subjects rated male and female sexual infidelity as well as male and female emotional infidelity on a scale of very good to very bad. They modelled this data with level of male care for children. Males seem to be more concerned than women with sexual infidelity vs emotional infidelity. None of this should be that surprising. These traits are genetic. When males cannot establish paternity there is less incentive to care for them. Stand outs: the Karo Batak of Indonesia for low tolerance of sexual infidelity and high male parental investment. The Himba, a bantu group from namibia, apparently absolute whores with low male paternal investment. I think wealth of a society has a big impact on this shit. The more wealth one accumulates the more important it is to establish paternity for inheritance purposes. Think of the implications this has for UBI and other welfare schemes. Heres some supplemental shit for people that like charts. http://researchonline.ljmu.ac.uk/id/eprint/10907/7/FinalSI_Jealousy.pdf