Old man and young wife are very much in love. Only one problem - the old boy can't fulfill her physical needs.

They go to see a sex-therapist, who advises it's a very common problem. He tells them that the next time they make-love, they should have a handsome naked young man standing next to the bed where the young wife can see him in all his glory, and this young man must waft a towel over them as they make-love.

They thought it a bit bizarre, but they gave it a go. They got the chap from next door who fitted the bill perfectly to come round and do the biz. Unfortunately, the woman remained unfulfilled.

They went back to the sex-therapist and told him. He said that he thought this may happen, so next time they should have the handsome young man from next door make-love to the young wife and have the old husband stand naked where his wife can see him in all his glory wafting the towel.

Well... the young wife and the neighbour went at it like rabbits for an hour solid whilst the old-husband flapped his towel furiously. All three were dripping with sweat from their efforts, and then... miraculously... the young wife had a ground-breaking, earth-shattering climax!

At that point the old husband tapped the young neighbour on the shoulder and said, "now THATS how you waft a f***ing towel sonny"!

genius