In that case, yes hotels often use single beds strapped together to make a double bed. It gives them the flexiblity to change the configuration of the room and make it a twin or a double.
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The most luxurious accommodation in a hotel is often called the presidential suite or royal suite.
Hotel policies on additional guests can vary widely. While some hotels may allow a certain number of guests per room at no extra charge, others may charge a fee for any additional person, regardless of their age. Some hotels may even have strict occupancy limits to maintain the comfort and safety of all guests.