This article feels like it's full of no big mystery being unlocked other than the clitoris non-sexual stimulation being used as pain treatment during labor, but I'm sure not as effective as just some potent pain killer.
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Smooth muscle contractions involve the same nerves and muscles in orgasm as in childbirth contractions.
Uterine contraction > Labour and pregnancy, In orgasm https://en.wikipedia.org/wiki/Uterine_contraction
Birthgasm https://en.wikipedia.org/wiki/Birthgasm
In terms of evolutionary origin and adaptation and natural selection (mutation, crossover, selection), all amniotes (reptiles, amphibians, mammals) have a clitoris.
Animal clitoris https://en.wikipedia.org/wiki/Animal_clitoris