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NASA scientists says astronauts should not masturbate in space
(www.indy100.com)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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The chlorination of a public swimming pool is deadly to sperm, so I imagine the chances on a spaceship are a lot higher.
Also "easily seeing and avoiding" is just not realistic. You don't have eyes on your vulva that are focused on checking for stray sperm globs 24/7.
Haha imagine a female astronaut free breeze for the lolz. Maybe even the reason the male astronaut is cranking.
Clothes they are wearing clothes.