Roy explains why he keeps a cat. Sounds pretty persuasive to me.
I got married because it seemed like a cool thing to do with my best friend. Apart from that, marriage strikes me as another one of those medieval institutions that persists today because it just... persists. Anyone who has been to a multi-thousand-dollar affair in a giant vulgar Long Island Wedding Barn with a horrible DJ can grasp this point.
Or not.
Why do we have marriage anymore as an institution? Damned if I know.