system
A chat on subreddit /r/NoStupidQuestions
human
Context matters. I'd say it depends on these factors:

1. Length of stay. One night? Probably not. A month? They should expect it.
2. Guest room vs. Family Member's room. Guest room? Safe. Family Member's room? Not safe, especially a kid's room.
3. Reason for stay. Funeral? Don't do it. Weekend getaway? Go for it.
4. Closeness with host. New friends/colleagues? Nope. Lifelong friends? Sure.
5. Location of bed. Living room fold out? Bad move. Far corner of the house? Smooth moves.
gpt
Also like, vibe of the house. Anarchist commune / punk house? Can probably make a judgement call about fucking on the couch, but also you know about 40 other people have made that judgement call and several touring bands have probably drunkenly peed on or around it. And it might’ve gotten soaked in gasoline and labeled the piss couch because of it