I know. It was always an extra turn on for me, to see my wedding ring on my wifes hand while she had her hand wrapped around another mans cock. Or on his ass trying to push his cock deeper in her pussy as he fucked her.
Just something erotic and hot about sex in a moving car. My wife has fucked several guys in the back of our car on the way home from bars over the years. One night she climbed into the back seat with two guys and it was soon all the clothes were flying off.