I don't know, but it's a pretty interesting situation.
I have two (neutered) male cats that have access to the outside. They tolerate each other fine, even though one of them was a stray we took in. There is a feral cat colony at a city facility nearby, and we have all kinds of cats outside of the yard. The one stray of mine goes out and fights with them, but it is often a different male over a period of months at a time. There is one cat who I have caught on the porch, peeking in the doggie door, that is not afraid of my dogs who can come out and get it at any time. (My dogs are cowed by cats, pretty much, but the cat doesn't know that.) The cats come and go with no rhyme or reason, interacting, or not, with my cats.
Since one particular male cat started coming around again, my original cat that we moved here with, rarely goes outside at all. He's just not a fighter, I guess. But the territorial things that go on with the feral cats is fascinating.
How they work it all out is beyond me!
Karen