You can have a body like that without breeding. I've got saggy skin and stretch marks because I got super fat and then lost weight. But yeah they never cover the complete destruction of the woman's body in sex ed and they really should. Like just show a full body photo of a nude woman post-childbirth. Show the navel-length tits with dinner plate-sized off-black nipples. Show the lumps, stretch marks, sagging skin, flesh apron, show all of it. Most teen girls put a lot of thought into their appearance and if they know that's what they will look like, I bet it would make them use protection or think twice about sex.
And that's just the changes to their appearance. Then you talk about the internal damage like pelvic floor issues, incontinence, uterine prolapse, gestational diabetes, vassholes, weight that never comes off and the 1000 other problems women develop from serving as broodmares.
But you can't control what body types people are attracted to, and you also never know what kind of a trash fire is hiding under someone's clothing if you're sizing them up as a potential lay. Some people are probably super attracted to mom bodies. I mean if some people are willing to fuck corpses, I'm sure some people find the stretch marks and sagging skin sexy.
The permanent damage to my body is one of many, many reasons I do not want kids. I don't feel like pissing my pants every time I cough and I worked too hard to lose weight (with tons more left to lose) all for some fucking brat to ruin my progress.