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Barbs are not as well understood. There's a lot of factors. Sort of like most people know about horse cock flares and the media ring but a lot less know that mares have the whole winking thing. Or that female canines have a muscular internal tourniquet that traps the knot.
Male cats are barbed, and those barbs stimulate ovulation. Humans had barbs too at one point and with a mutation, some still do.
Outside of ovulation stimulating barbs, female cats have their own twist too. They have 3 pronounced ridges inside their vaginal canals that the barbs are specifically angled to catch on. The barbs don't catch/drag on everything they come across, just physical shapes that are of the right angle and firmness to get them trapped.
This is why lions do that shaky leg flutter hump, and then smacked in the face when they pull out. Those 3 bands of muscle only get spiked on full withdraw. On top of that, the "Stand up" with ejaculation, which explains why the lioness only reacts so terribly after the fact.
Housecats being imbred mutants, unfortunately, lost some of those features like hardening barbs, they just stay hard from the moment of erection instead of ejaculation... which is why housecat sex sounds so angry.
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