Many years ago I had a cat who would poop on my pyjamas if they were on my bed or just somewhere on my bed if I didn't come home at night. Your cat is thoughtful enough to choose an easy to clean spot, or wasn't as annoyed as mine was. I have a female now who expresses her frustration at my longer absences by peeing on my bed or pillow. I really can't afford to be a stay at home kitty mom. Why do my cats all seem to have a bed fixation!!!!