Not at all an astronaut, but spanking it in the privacy of your rack is a perennial passtime aboard any vessel undertaking long-duration voyages. At least on ships, you can get lucky and find an FWB, though I know nothing about how it might work mechanically in space, though I’m sure it’s happened at least once.
Officially sex between astronauts/cosmonauts doesn’t happen and there’s been some suggestion that getting aroused in the microgravity environment isn’t even possible. Unofficially, well who knows? I’d like to hope that at least one couple have experimented and who can blame them? The ISS has plenty of nooks and crannies to hide in if you want a few minutes of privacy. I’m also 100% certain masturbation has at least been attempted.
There was one Shuttle mission that had a man and wife, within the confines of the Shuttle it’d be almost impossible to have any privacy but maybe the crew did them a solid.
This needs to get to the front page.
No idea, but I’m just reminded of this NDT quote: https://twitter.com/neiltyson/status/36776479320702976?s=21
Probably saltpeter in the food. Got no sexual needs if they’re chemically blocked taps forehead