It can also be called an assjob or butt-job. Sometimes considered a form of "outercourse".
I believe it's more common among the religiously repressed communities.
LOL. And I have to agree. I think it goes back to grammar school days when as boys start to approach puberty there is a constant conversation about fucking girls. Every possible sexual activity is joked about using the most crude terms available. And I have found that no matter how old they get, males still talk about sex like they were teenagers. Two really old guys sitting in a bar. A young woman walks by that could be their granddaughter and they can still have a conversation about wanting to fuck her and how they envision doing it.