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> the solution will naturally appear to large enough number of people, evolution shaped us to reproduce.

The solution evolution found was to make us really like having sex. But then we invented hormonal birth control, and sex became uncoupled from reproduction. Evolution can't help us here, it works slowly over thousands of years, and can't uninvent birth control.

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> it works slowly over thousands of years

This isn't always the case; evolution can happen relatively quickly in response to rapid changes in the environment [1]. There are plenty of people alive today who have particularly strong urges to have children, and the widespread introduction of birth control creates a major selective pressure towards any heritable genes that produce or enhance those urges. The effects of this could be very significant over even a relatively small number of generations.

[1] - https://en.wikipedia.org/wiki/Punctuated_equilibrium

People will just start really like the idea of having children and will consciously do so

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