Ah but it was the word "filthy" that attracted so much comment wasn't it?
Speaking of Rugby songs - I have always wondered why "The Maiden's Prayer" a variant of "The Butcher's Boy" - collected in The British Isles and in Australia - can be found among rugby songs. It contains the word "virginity" but there is nothing else remotely rude about it. If you start to sing it here in Australia,(folk clubs excepted) people start to smirk before you've even got to "... stole of her virginity" I've been told there are rude army versions but the only words anyone has ever been able to come up with were the same ones I sing. I did find it in a book of "Rugby Songs" but it was exactly the same. The other songs in the book could only be described as filthy. It was like finding a pearl in a swine feed trough. Sorry I really like pigs but you know what I mean.