Does anyone else have this problem.One of my cats (5 yrs old) just started to urinate on our bed about once a week.We moved about 2 years ago and in the other house we had a regular bed and she never urinated on it.After we moved to the new house we decided to set up our waterbed again and she started this business of urinating on it.I just don't understand her actions because she is the only cat that sleeps on the bed.We started to cover the bed every morning with plastic and that worked for awhile and now she knows how to get under the plastic so she can GO. What is with this cat and her actions.

Other cats in the area? Chasing her when she goes outside?

Once a cat pees in a place, it takes a lot of work to mask the scent she has left. Try shuting the bedroom door for a week or so. See if she pees anywhere else in the house.