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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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And since penises are usually not that close to the body's centre of mass it would also impart some rotation, unless the astrowanker has very good aim.
Yes. That’s so you can catch it in your mount on the way around.