A warning. You'll drive around for a while looking at women at the lowest point in their lives, most likely dependent on drugs and more often than not being exploited by a pump or addict boyfriend. You'll know you should go home but your cock is running the show. You think just do it and stop and let a girl climb in next to you. She looks awful but is offering a quick suck and fuck for £20, bargain to you but 2 light or dark for her. If you're lucky you'll finish up and drive home guilty. If your unlucky your number plate will have been picked up by the CCTV all around De Montfort St or Highfields and you'll get a letter from the police, you might even be spotted by a patrol car who regularly check all the known spots for taking a john. Once you get that letter you might have to attend an interview, you might have to go on a Change course, some jobs like those working with kids and vulnerable adults will be informed, if you get a caution it lasts 6 years and will be excluded from the Rehabilitation of Offenders rules so will stay on the police computer, trouble if you ever need an enhanced DBS for a job. It could even go to court and the Gutter press love reporting on this sort of story and it will be on their website forever waiting for someone to Google your name.
In short, take a bit more money out the cashpoint and visit a parlor or indie. Do not risk it.