Can a hotel kick you out if you let an unregistered guest share a room with you?

We are going to an event and because of this event all hotels are fully booked. Now a friend wants to join us, but can't find accommodation. We are okay with him crashing in our hotel room, either on the couch or on a self-inflatable mattress. We have done this in the past where we secretly sneaked the "guest" in.
It is not that we don't want to pay the tourist tax, it is that when ask and the hotel says no, we can't sneak him in, because we drew attention to ourself. In many hotels you can just order another bed, but there are also a lot that don't have that service.
I don't have any ethical problems with my behavior of secretly hosting a guest. I did pay for the room. I don't like being sneaky about it, since again I do pay for the hotel room. Also if I have to choose between sneaking someone in the room to crash on the couch or let him/her sleep on bench in the park. I opt for the first.
Am I just worrying to much and will being honest about it in the end be acceptable to most if not all hotels?
Best Answer
The answer will vary from country to country and from hotel to hotel, but in general you're not allowed to do this and if the hotel finds it out, they can kick you out or charge you a fine.
In some countries they can even throw you in prison (worst case). For example in the USA there is the Defrauding an innkeeper law:
A person who, with intent to defraud, procures food, drink or accommodations at a public establishment without paying in accordance with his agreement with the public establishment is guilty of:
A felony punishable by imprisonment for not more than ten (10) years, a fine of not more than ten thousand dollars ($10,000.00), or both, if the value of the food, drink or accommodations is one thousand dollars ($1,000.00) or more; or
Repealed by Laws 1984, ch. 44, 3.
A misdemeanor punishable by imprisonment for not more than six (6) months, a fine of not more than seven hundred fifty dollars ($750.00), or both, if the value of the food, drink or accommodations is less than one thousand dollars ($1,000.00).
I think in the most cases you will have to pay an extra fee.
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Can a hotel let someone in your room?
In general, during a guest's stay at the hotel, only the guest may consent to a search of his or her room. While hotel staff members may access the room for cleaning and maintenance during the guest's stay, they are not authorized to allow police to enter the room.Do hotels care if you have guests?
In some cases, a hotel may be charging based on how many guests are occupying a room. But in other cases, a hotel may request that information so that they can ensure they are complying with the fire code, or so that in the event of an emergency they will know how many guests should be accounted for.Can you sneak an extra person into a hotel room?
Re: Can we sneak an extra person into our room? As long as security doesn't have to come to your room to break up a loud party, you'll have no problem. Even if they do come to the room, you can just say that one of you is staying elsewhere if they ask.See Which Hotels Were Caught Not Changing Bedsheets for New Guests
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Answer 2
As far as my experience is concerned, it is the registered guest's prerogative as to whether to entertain guests in their room. If this were not the case then romantic rendezvous in hotels would not be permissible. I've never had a hotel decline this privilege and in many cases I have requested additional room keys for my guests. Of course, the maximum occupancy of the room must be observed.
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