Yes, I did read your posts, anni7 -- but I have to agree to disagree on the issue of neutering. Many male cats have graced my life and I have had very little trouble with spraying because my cats were always neutered, and my female cats always spayed. They will never have more kittens who do not have loving permanent homes because of overpopulation, their health will be better, they will be more calm and happy, and they will probably live longer. Those are the reasons to neuter.If you read my posts above (I assume you did not because I already answered the very same suggestions that they do spray regardless of being neutered). Cat spraying is a normal cat behaviour when they see other cats especially. We live at the moment in a multi storey building. There are several cats and they come to our level. So the place where the spraying occurs is often next to the door or the window.
I don’t think neutering will help most of their issues. I also explained in my posts how many cats that I known for years and other people I know well- the neuter didn’t always lead to them having no issues with each other. Some cats I knew not neutered lived in together - which I do agree is strange in case of males of many species of animals fight.
I don’t want to neuter my cats while they are healthy because I see no reason to.
Yes, some cats are bothered when other cats visit where they can see them. Jackson Galaxy and other cat behaviorists address this issue as well. Using feline pheromone mimic such as Feliway can and does help to make cats feel more confident and they feel less need to spray-mark territory.