Another version:
Fisherman sits by the river with a brick on his head. A young woman walks by and asks: "What about the brick?"
"I will tell you for a quickie!"
She leaves offended, but comes back and sure enough they have a quick tumble right there on the grass.
Than she says:
"Now, what about the brick?"
"I am fishing since 5AM and nothing - but for the trick with the brick, you are third."