Pretty sure that's factually incorrect. And 'having children' =/= 'being in a relationship'. Not everyone was married. Lots of our ancestors had bastards/were affair partners/victims of sexual assault. And lots of ancestors gave their kids up/walked out of relationships. Forced procreation is a thing and I'm willing to bet lots of our ancestors had urges to be single and childless. I think you're misusing the word 'urge'.