I haven't read through this thread, so maybe I'm just repeating more advice. Anyways, I work at a cat clinic. Your cat may be doing this for one (or a combination) of several reasons: 1. Behavioral. The cat is marking what it perceives as its territory. Maybe there's been a change in the home or the bedroom, a decrease in the amount of attention you give the cat - who knows. 2. Could be the urinary tract infection, but the symptoms usuually are bloody urine spots coupled with the cat going back and forth into and out of the litter box. 3. A stone. roughly the same behavior as if the cat had a tract infection, 'cept it's probably more painful, and with male cats, a blockage could occur. Definitely take the cat to the vet. They'll probably want to do a urinalysis either in house, to the lab, or both, as well as X-Rays. The cat can't tell you what's up, so the doctor has to find out.