Good example for the extreme lengths people go to. Yet there is a huge difference in effort of fathering a child vs. pregnancy and delivering a child. Regardless of the parent in either case disappearing afterwards.
True, there's a big difference both in personal effort and the impact it has on the other party. I recently watched a Netflix spy drama "Black Doves" in which a prominent politician's wife turns out to be a spy contracting agency plant, who's had two kids with him. That really would be fantastical. I'm not aware of any real cases of it happening where the agent is female (and nor is Claude code FWIW) - the linked article provides some evidence in the form of hearsay.