My Cat Only Loves Me On the Toilet

No matter what time of day, whether I'm actually using it or just sitting on it, Grissom wants to love me when I'm on the toilet. It's the weirdest thing. It's one thing when he shares my pillow or climbs under the blanket with me, but this is a whole new kind of love. Hugs and kisses and snuggles. It's disgustingly cute. Why can't it happen on the couch?