Does your pet want to join you in the bathroom?

My youngest cat never loves me more than when I'm on the toilet. I don't get it. If I want to sit with her on the couch, she can't be bothered or has better things to do, but when I'm on the toilet, she is purring loudly and rubbing up against my legs. Our bathroom has louvre doors and she soon figure out that she can open it by reaching in a the middle, where the split in the door is. I put a latch on it, and she soon figured out that if she jiggles the door rapidly, it will sometimes come out. Failing that, she will sit outside the door and howl like I had locked her out in a thunderstorm or something. She's the only one I've had that did that though, although I had a Siamese once who would climb into a full bath with me.