Yes. At night, parked outside my place with a woman who gave me a lift home from a house party where we met for the first time.
We were doing it reverse cowboy, both of us sitting in the front passenger seat.
Just then, my girlfriend brought the trash can out to the kerb for collection the next morning, right near the car.
She didn't appear to see us or she would have put me out with the trash.
We continued fucking in the car but the passion was killed for me. I think for her too, though I didn't say anything to her about my GF.