If you are not harming anyone, there is no limit. E.g.: I would not want to see people murdering each other even if they are consenting. I would not ever eat dog meat, but I am fine with other people eating dogs or cows or pigs or whatever.

You can throw your punch anywhere, as long as my nose is not in there. (Take this sentence literally)

Please do not get into the metaphysical debate of what harm will mean broadly. Not in the mood.

Adult people having a fun night in a hotel room is not harming anyone.