When my daughter was an undergrad in college, I let her boyfriend who lived in NJ stay in her room when he came to visit her over the summer in DC. We lived with my dad who questioned me about his sleeping in her room. This was over 20 years ago so I don't remember what I told him. I guess her bf could have slept on the plastic-covered couch (not very comfortable; he was a big guy), but I figured they were gonna have sex one way or the other, so it might as well be in her room. We here in American are still living under the thrall of Puritanism. The Dutch way makes so much better sense.