I asked startpage.com an interesting question about "pair-bonding" or "mating" and discovered a free Anthropology textbook of some kind:
Behave: The Biology of Humans at Our Best and WorstThere was also one called
Race, Evolution, and Behavior. Whereas neither Arthur Schopenhauer or I would have anyone believe in "race," there are traits in strains of our diverse species that have been influenced by climate and ecosystems.
“(An) incendiary thesis....that separate races of human beings evolved different reproductive strategies to cope with different environments and that these strategies led to physical differences in brain size and hence in intelligence. Human beings who evolved in the warm but highly unpredictable environment of Africa adopted a strategy of high reproduction, while human beings who migrated to the hostile cold of Europe and northern Asia took to producing fewer children but nurturing them more carefully.”
—Malcolm W. Browne, New York Times Book Review
I did not get any real answers to my personal question, but it is most likely more of a sociological question. The search engine is coming up with anthropological and biological answers.
That's why I am "tossing" these results into this section of the message board, the so-called "junk drawer" ... I will return to this some other time, maybe ...