There is no shame in being prepared. Can the fancy seat cushions be covered or removed? And wearing a nappy is customary for all astronauts who may have to wait overtime for the launch....The only problem, if you are flying with strangers, is overcoming all those well taught inhibitions and letting it go!
What IS a shame is flying badly because you need to pee, or crashing and rupturing your bladder if you impact with a full tank....