In this scenario of homosexuality versus smoking cigarettes.

I mean, its your house.

No one is really defending the position that two homosexuals can break into someone's house and kiss there in a sexual way and do all kinds of hot things that would probably be fun to watch.

You're not objectively wrong.

Sometimes things bother us and it's very hard to change even if it's technically irrational. There are thin plastic seals on food containers sometimes have a film of the food substance (like yogurt) and people take off this film and just lay it somewhere or worse leave it on the container under the lid. That drives me nuts. Like full blown OCD I have to throw it in the trash instantly.

I try to not make it other people's problem, but it's hard to not ask them to stop. Maybe your comfort is worth more than something they didn't even think about?

There's kissing.

And then there's kissing.

The former is a widely regarded method of greeting.

Whereas the latter is widely regarded method of sexual foreplay.

So I would impose an absolute ban on the latter, irrespective of the make up of the participating couples.

It becomes your problem and business at home literally.