Doing private activities at someone's else house!!!???

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Hello everyone, I want to ask your opinion on this situation and if you ever did that at somewhere in a friend's or family house. Last month ago, the cousin of my mom came to visit us in Canada with her husband for 2 weeks. So we agreed to greet them in our house and give them a room to sleep for their vacation here. In the beginning, my mom decided to let the couple sleep in my bedroom but she changed her mind because the furniture is new and I should be the first one to enjoy the bed. So we sent them to sleep in my grandma's room. Everything seemed fine until they left. When my grandma went to her bedroom, she discovered some dried spots on the bed sheet and blanket. I find it really gross and disrespectful. I mean how can they do this in an elder's room? Anyway, I think it's just wrong to do it in a house which isn't their's. Can't they control themselves for 2 weeks? My grandma was really angry. On top of that, the couple went to sleep at my aunt's house for a couple of days in my cousin's bedroom who's only a teenager. I wonder if they did it over there too. So is that something normal to do that everywhere? *shrugs* I am glad I didn't let anyone sleep in my room...probably never will after this.