audi joke over 18's only

A German visiting London asks a hooker for a shag and she tells him
it's twenty quid. "Fine," he says, "but I'm a bit kinky." She agrees
that this is OK as long as he doesn't do anything violent.

They get back to her flat and he gets out four big springs attached to
some straps. "I want you to put one of these on each elbow and one on
each knee," he asks. The hooker is worried that she's getting into
something a bit heavy, but she goes along with his request.

Then she is told to get down on all fours, naked, in front of him
which she does grudgingly.

Then he asks her to start bouncing up and down on the springs and
finally he takes a duck call whistle from his pocket. "Blow on this
while I'm shagging you," he tells her.

So he's banging away while she's bouncing on the springs blowing the
duck whistle. Suddenly she starts to enjoy the shagging, so much so in
fact that she experiences the most fantastic orgasm she's ever had.

After they've finished she says, "Wow, that was the most fantastic sex
I've had in 25 years on the game, how the hell did you make it so
good?"

"Ah," he replies, smiling, "Foursprung Duck Technique."