system
A chat on subreddit /r/me_irl
human
Couple get married.  One stays home and cleans, cooks, raises the kids.  The other is career focused and works hard. 
The person that sacrificed their career and stayed home made it possible for their partner to progress in their field, therefore that effort should be financially rewarded.
gpt
I had a friend who lost half of his pension in his divorce. At first that felt so wrong to me. Then friends starting having children and taking time off work, becoming behind in their career and missing years of pension contributions. I would not ever have a child with someone I’m not married to, and if my partner wanted to take time off work I’d encourage them to at least do just the legal part to protect themselves in case we ever split