For me, it’d be very important for a significant other to have at least some degree of interest in pee - and ideally speaking, the greater their enthusiasm for it, the better.
It’s just far and away my biggest kink/turn on, and so I know if I were to be with someone who didn’t share that at all, then it would only be a matter of time until would want that fulfilment from elsewhere - so yeah, definite high priority!