I'm sure it's fine to ask...
While you're at it, let your significant other ride along in the front seat and have heated debates about politics, religion, and/or abortion.
Be sure to stop at an adult novelty store on the customers time and dime. Before you go inside to get your adult material, ask the pax if they want anything like motion lotion while you're in there. Assure the rider you don't mind.
When you get back to the car, tell the pax to make room for another rider as you put a seatbelt on the blow up doll that you just purchased. Make sure the doll is sitting upright so it doesn't roll over onto the pax. That would be rude and would be invading the rider's space.
As you head to the pax final destination, tell your significant other to "beer you". And then get angry when he/ she says you can't shotgun the beer cause you'll make a mess.
If a cop pulls you over, tell the pax to hide the booze for you and ask if he/she can crotch your sack of weed.
When the cops smells beer, point to the pax in the back seat and tell him you tried to stop the person, but he or she wouldn't listen. Then whisper to the officer that you suspect your pax has drugs too.
As your pax is being put into handcuffs, remind him or her to rate you 5 stars. This is also a good time to remind the pax that tips are appreciated. Just ask the cop if it's OK for you to reach into the arrested person's wallet or purse to retrieve your tip.
And don't forget to thank your pax for riding uber.