Oh man, sorry I missed your reply. I had to go back to diving into a school term paper and a group project for my professors💀, and when I dive into hw I sometimes forget my surroundings ðŸ˜.
To answer your question, I actually haven't gotten that far myself🥲. But last I went to the love hotel, I was given a quest after talking to that police duo. So I'm assuming the love hotel will open up after I complete the quest for getting the owner of the hotel to help out the police in staking out their suspect.
For me, I couldn't outright do the quest because it said my Knowledge Stat was lacking. So I have to go back and build that first (via reading books in the library or watching the news when your at home). So I'm assuming once I have a full knowledge meter, and go back to complete the quest, I will unlock the love hotel options👀 🙌!