Re: I wonder...
"You've raised the question of how do male astronauts relieve pent-up tension while in space. Into a sock?"
Since it's space, an incredibly hostile and unnatural environment for humans, I'll actually respond.
Considering the low atmospheric pressure *and* microgravity, one is already bloated, has incredibly stuffy sinuses and frequently suffer from motion sickness.
Yeah, not wanting to fuck when I'm about to puke.
And my experience is exclusively on Earth.
There are other issues present, such as stress from being a second to around a minute from being dead, the dread of actual illness with only amateurs to give actual help and the potential for a paint chip to offer you those seconds to a minute time until death.
Now, add in an impressive mission load, where every spare second is consumed, to avoid boredom, idle experimentation that isn't authorized or even opening the airlock to sniff external environment.
Yeah, no sock or anything else required.
Hell, under those conditions, it's likely that an erection would be decidedly uncomfortable.