Lucca on 18 December 2018
We (as well as pretty much any living being) are “programmed” to sustain our species. It's just natural that people feel the urge to have children and pass on their DNA. It's not egotistical, it's just what living beings do. Why do you think we feel pleasure during sex? Because that incentivizes that practice, increasing the change of pregnancy. Basically the whole point of our existence before civilization was to have kids.
