Both our cats like to mark things. Luckily they do this by pressing and rubbing their heads against stuff instead of peeing on things. The cat that pees on things only does it when she is mad at us.
Apparently my glasses below to the cat. I know this because she keeps marking them - while I am wearing them. She also likes to lie on my arm rest with a huge portion of her body resting on me. I don't really know what personal space is anymore.