I don't care if they're having sex. I care that my tenants are being subjected to it. I can't afford to lose tenants who are paying a lot of money to live here. In my recent situation, the young couple is local, arrived intoxicated with no overnight bags, and told me the guy's roommate was sick. I both explained and gave them a letter asking them to be aware of their activities and voices, and I know they totally got it. Later on, after her wailing, I sent them a text that was apologetic and diplomatic, yet clear that I would appreciate their sensitivity. No reponse. A little while later, they were at it again, and she was LOUD, and then they were talking very loudly and making other noise moving chairs around or something. At this point it was nearly 11 pm, so I sent a second text and no response until over an hour later when he wrote "just saw this," but did not apologize. I have never had a guest say they were here on a honeymoon but I've also never had a guest show up with no luggage. When he inquired about the room, he asked if I would be there and some other questions which immediately sent up a red flag to me that (and I was 100% correct) they were looking for a room to get it on. Then they arrived an hour after they specified their arrival time, and reeked from alcohol. Exactly what I had anticipated.
After reading other comments here, I decided to alter my room description to say "This is not an appropriate room for a 'romantic getaway' due to a Victorian's thin walls/floors and downstairs tenants, so if this will inhibit your freedon of expression, please consider other lodging."
As others advised, I'm not going to give the otherwise polite and nice guy a terrible review because I considered his drunk and ditzy girlfriend more of the problem, but I'm not going to give him a great review either. The two previous reviewers had very nice comments to make, so I would assume if he is alone, he would be a perfect guest. He was complimentary and communicated well other than the fact that they showed up late.
Let's face it: we can't tell people not to have sex. It comes with the territory and you cannot police it. All you can do is make people aware that there are children, other guests, and neighbors in close range and that the environment is not soundproofed like a hotel. In cities where people live in multiple units like myself, it is a difficult situation to not anger tenants who will create a problem for you, which is why there is now so much resistance to shared housing: people hating the additional noise.