A childhood belief about general

I used to think that the word "bowels" meant the two body parts that I've since learned are variously called "buns" or "buttcheeks". It seemed only natural when I learned that poop comes out of my "bowels". Since "bowels" is a plural noun, the only thing plural I could think of around where my poop comes out is those two lobes, which I then assumed for some time were called "bowels". The confusion finally ended after I had watched the movie "Lassiter" starring Jane Seymour. There's a scene where she's lying on a bed with her bare butt in clear view. My mother overheard me describing it to a friend. I said that Jane Seymour was lying there naked on the bed with her bowels showing. My mother seeemed shocked, and I was afraid she would be all after me for having seen a movie with nudity in it. But when I explained she seemed relieved, perhaps that a bare butt was all I'd been talking about. Maybe she feared I'd seen a movie with "disembowelments" and perhaps other such violence in it.
To this day, my boyfriend and I joking refer to "buttcheeks" as "bowels"