All jokes aside, naked woman who was planning on staying in the room for a few weeks and it just happens to be the room that the employee gives out when he thinks all the other rooms are taken? It’s been a long time since I had friends working in hotels, but the last few rooms available were usually held as a reserve for situations like this (i.e. so they have an ace in the hole to help out important/pissed off guests). So the fact that this exact room is the same room that already has a long-term, naked tenant is a little fishy.
It’s all just circumstantial, and not even particularly strong evidence, but it certainly seems suggestive of some sort of prostitution.