Based on the study Cross-Gender Social Ties Around the World, By Michael Bailey, Drew Johnston, Theresa Kuchler, Ayush Kumar, Johannes Stroebel.

More maps: https://pages.stern.nyu.edu//~jstroebe/PDF/BJKKS/_GenderTies/_Appendix.pdf

Aggregated data: https://data.humdata.org/dataset/cross-gender-ties