To mothers out there: does childbirth ruin you?

I mean like vagina-wise.

Here's the thing, I want to have like ten kids (because I think I have great genes, in all humbleness). And there was this chick who was blabbering about wanting to have many children, and I thought to myself, "Hey she got some tits, some nice birthing hips, she's a good candidate to perpetuate my genes!" and she was like, "He's got some money, cool then" and I was like, "I also got some prenup bitch, calm your tits" It was the perfect love.

So anyway, I get someone to carry my kids, and she gets a nice home and financial security in return. We don't see each other that often, and we're not exclusive, but I still shag her every once in a while because well I got the money and we're technically husband and wife.

So here's my question: will her vagina be ruined by the fourth or fifth kid or something, like become gaped and all, or will it always shrink back?