Hotels are full of strangers, people who just book in for a night and then are gone.
Many of theses people are oddballs, many look weird, some even look half way normal.
Hotel guests may even invite people to their rooms.
If you are worried about being caught by hotel staff who "know what you are doing", don't. They don't care, they aren't paid enough to care. If you still are worried probably better you stay at home with your slippers and a mug of cocoa.