A truck driver was going down a steep incline when, at the foot of the hill,

A truck driver was going down a steep incline when, at the foot of the hill, he was able to make out a couple having sex in the middle of the road.
Five times on his descent he sounded his horn, but they didn't move.
He finally brought the truck' to a halt inches from them.
The truck driver got out and stormed: "What the hell's the matter with you two?
.Didn't you hear me?
You could have been killed!
" The man replied nonchalantly: "Listen, I was coming, she was coming, and you were coming.
You were the only one with brakes."