No, not what you might be thinking... Instead a funny story after the fact. Years ago, I met this nice lady who reciprocated the interest. As is usual in the early stages of the relationship, we were like rabbits. Any place, any time was good (also, we were both cheating on other folks at the time).

One summer evening we stopped in a parking lot, just could not wait. In her car, both buck naked having a grand old time when I go for leverage and I lean on the horn with the palm of my hand. Next instant, we see some guy start walking our way to see what the noise is about...

We ducked down real quick and froze. As luck would have it, he passed by without looking inside the car.

Needless to say, we made sure to use the back seat (now I understand!) the next time