"Yeah, well, if you have an economy that can make more stuff per person, they also buy larger houses to contain all that stuff. This place we're currently staying is larger than my parents' house by a factor of 10, but only because they were work-focused people who didn't have enough different hobbies that they'd want that many separate rooms. My parents could in fact have afforded a house this size, though they couldn't have afforded to fill it all up with things we'd consider expensive."
"So yes, separate rooms for sex, because you own stuff that optimizes sleep and stuff that optimizes sex and they are almost entirely not the same stuff for anything larger-scale than a small pillow."
"I have been trying to figure out where in a bedroom you'd have sex, because the bedrooms here do not have anything that looks to me like good surfaces for having sex on. It is now occurring to me that people here probably have sex on the things you call beds, and then change the cloth outer surfaces of the bed, and then go to sleep there."