Different culture, when used to subdue and forbid what others do, stops being a goal of a xenophilic society and starts being a nuisance to personal liberty.
I am a xenophilic person, and I am absolutely disgusted by things such as this.
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.
Are you sure? What if they publicize it? And why is "harm" (as vague as that can be) the main determinant of how one should act? What if such harm is not immediately obvious to us?