"Bumming" in the US could mean angry and/or depressed, a usage related to "That's a bummer, man," or "I'm bummed out about school right now."
It can also mean borrowing, as in "I been bumming cigarettes for days now," but that makes no sense in context. It wouldn't have anything to do with anal sex.
My personal favorites are The Third Ring
and Oscar's Place
My most recent story is Love is Enough
, a story about an aspiring playwright and two ghostly flappers.
Next up is a Summer Luvin' story tentatively named "Stinky and Fudd"