It's pretty well known that sexists regard women as frail and weak and I imagine we can all recite their "reasoning" by heart. But what I don't understand: Why are they so often worried specifically about the uterus?

The instances off the top of my head:

When trains were invented, they were afraid uteruses couldn't handle the inhuman speed (1).

Ski jumping was only made olympic for women in 2012 (not a typo! 11 years ago) because now it was the impact of landing that had their panties in a bunch (2).

And what do I read today? Apparently NASA scientists were afraid that in weightlessness, the blood&lining couldn't come out during periods (3).

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So what gives? Why not, say, the breasts? Or the labia minora?

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I would also be delighted to read other ridiculous examples of men clutching their pearls at situations that may be harmful to the uterus.

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Sources:

(1): https://www.mentalfloss.com/article/67806/early-trains-were-thought-make-womens-uteruses-fly-out

(2): https://activelivinglab.com/olympic-ski-jumping-competition-completed-without-a-single-uterus-explosion/

(3): https://www.nationalgeographic.co.uk/space/how-do-women-deal-with-having-a-period-in-space

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Edit:

u/willawong150 has posted an interesting comment with a source I would like to put in here as theirs is a nested comment that not everyone is going to see:

I get that but zero gravity is a different ball game when it comes to effects on the body, we’re still learning the short term and long term effects on our bodies. Anyways I did do some reading into it and it definitely came from sexism.

https://www.npr.org/sections/health-shots/2015/09/17/441160250/what-happens-when-you-get-your-period-in-space