Hi In a neutral way, I think the writer is trying to say that, whatever weird and wonderful experiences we may have when we're young, many of us - sometime in our twenties or thirties - find that we have children. And though we never thought we would, it's actually quite nice. (Lots of people, of course, don't go through that and there's no reason why they should, or should want to) Our writer - and I can only say that it is very dodgy indeed - is trying to say this is evidence that people feel the specific need to recreate their own race.
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