The View From the Throne

I strive not to be indelicate. However, this post nay be considered thus.
Sixto loves the bathroom. When John takes his shower, he is joined by the black cat, who strolls around the rim of the tub between the curtains. If the door is closed before he hears the running water, he sits at the door and demands entry.
When I go in to, uh, use the facility, he comes running in, throws himself flat on the floor in front of my feet and stretches out on his back, requesting a belly rub. I have never had a cat that interested in that particular human activity, or assuming that I cannot function without him.
'Tis  a puzzlement. He has no respect for privacy.