Why do people keep having kids and sex and partying all the time?

I’m at an age where I assumed folks would have grown up and come to their senses. I’ve parted with friends because they keep popping out kids, or they don’t take care of their kids (guys), they party all time drinking and drugging, they get in wild situations with folks that mistreat them and their possessions..
I’m single by choice and in bed before ten at night and keep to myself.

Are people searching for rock bottom? Like grow up
Why do people keep having kids and sex and partying all the time?
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