Why do some gay/bi men call it that?

In my experience both in person and online chats I’ve noticed men been referring to their butthole as a “pussy”. I’m wondering why a good amount of them do? I’m fairly new to having sex btw . Like it kinda throws me off sometimes when in the moment. Like is their gonna call it something maybe say “bussy” , like that’s less strange. Or call it what it is . I just want to know why this is common to call your “ass” a “pussy”?