I have only done this once in Kings Cross that was a blowjob from a desperate street homeless girl.
There is some excitement and thrill with outdoor fun but don't think its safe anymore.
However, just recently was on my way home one late night and stopped at a petrol station to withdraw money.
There was this black girl having problems withdrawing money, seemed desperate for cash and looked like she had none left.
She approached me and asked if wanted any company but politely declined.
Though now am thinking maybe should have accepted as she was alone,desperate for cash , not stunning but might have done
the business for any amount of cash.
I had a car and was in the position to exploit the situation.