Exactly, and that's one of the beauties of the thing. You can buy a huge pair of boobs, that's not possible with feet.
Or with asses. Well, I guess technically you could, but it's far far less common than fake boobs.
Never really got the feet thing, and I consider myself extremely open minded. But hey, to each their own I guess hehe
I think fake arses are becoming more of a thing nowadays, but yeah, boob jobs are still much more common.
No matter how open minded you are, there are always some things that just aren't your cup of tea, and that's okay. Personally, I've never got the butt thing.