"Sheep Shagging" joke

Sheep Shagging
A researcher is conducting a survey into sheep shagging. First of all he visits a Cornish farmer.
"So, Cornish farmer, how do you shag your sheep?" "Well, I take the hind legs of the sheep and put them down my wellie boot and take the front legs of the sheep and put them over a wall."
"That's very interesting," replies the researcher and he leaves the Cornish farmer. Then he meets a Midlands Farmer.
"So, Midlands farmer, how do you shag your sheep?"
"Well, I take the hind legs of the sheep and put them down my wellie boots and take the front legs of the sheep and put them over a wall."
"That's very interesting," replies the researcher. "That's how they do it in Cornwall too." And he leaves the Midlands farmer. Then he meets a farmer from Abergaveny.
"So, Abergaveny farmer, how do you shag your sheep?"
"Well, I take the hind legs of the sheep and put them down my wellie boots and take the front legs of the sheep and put them over my shoulders."
"Over your shoulders?" replies the researcher. "Don't you put them over a wall like everyone else?"
"What?" says the farmer. "And miss out on all the kissing?!"