A race that is misunderstood by their neighbours the English due to their craftiness and intelligence. The English call the Welsh sheep-shaggers due to an old trick used by the Welsh against their gullible English neighbours in medievel times, when the English had a nasty habit of fucking sheep. When Wales adopted English law they noticed the penalty for shagging a sheep was less than stealing one (due to the English's habit) so whenever they were caught stealing a sheep they would instead say they were planning to fuck it instead to avoid the fine. 
Therefore there is a very long list of crimes involving Welshmen shagging sheep, although it is only the English who would actually ever fuck a sheep, it is just another example of the Welsh tricking the English once again.

Englishman "You are going to have your hand chopped off with an axe because you stole a sheep." 

Welshman "I was infact taking the sheep to fuck." 

Englishman "Oh, thats good then our law endorses sheep shaggers. You will only have to lose a finger.