I had this happen to me too about a year ago – I solved it by requiring at least a 2-night stay to reduce any one-night hookups and most importantly, I almost NEVER rent to anyone within an hours drive. It’s just not worth it. I’ve done it twice (another time after this one) and I regretted it both times. The only exceptions I make are for family reunion-type visits.
Here’s what happened: A guy asked to stay for a night with a guest. He was local and when I asked why, he said they just wanted to get away. He lived in Salem, MA and it was October so I figured it was to get away from the Halloween crowds. I went against my gut knowing it might not end well. I was new though and experimenting. He arrived and let himself in (we rent out our downstairs but have keyless entry and I don’t meet guests unless it’s convenient/desired). From the moment they arrived to the wee hours of the night we heard very loud moaning. It woke us up at times.
I didn’t kick him out or say anything because he wasn’t violating any rules and of course, I’m not going to embarrass him or the woman. But I was offended. Not because they were having sex, but because it was so rude, in your face, nothing discreet about it. I found it offensive he’d go into someone’s home and act like that. Get a hotel room or a place that’s not attached. It irritated me.
I waited until he left me a review and I left him a short, positive review too – he did leave the place very tidy. Then I privately emailed him and let him know it was not okay and he may want to consider other people are not going to appreciate it either. Never heard from him. Promptly changed my policy.