Read at your own perils (at least -1D10 points of SAN)
https://psychclassics.yorku.ca/Harlow/love.htm
https://en.wikipedia.org/wiki/Harry_Harlow#Partial_and_total_isolation_of_infant_monkeys
https://www.eileenmcginnis.com/blog/2018/1/26/love-and-cruelty-psychologist-harry-harlow-attachment-parenting-and-parental-ambivalence