I just looked at it myself, and I can see why Susan might be upset. It is one of the more graphic of our bawdy songs, and not exactly what you'd want to share in a tender moment with your young daughter while looking up the words for 'the Ash Grove'.
Perhaps this is just part of the educational services provide by Mudcat and the greater folkmusic community.
The odd thing is that 'The Mayor of Bayswater's Daughter' comes up first on the list when you search 'ash grove'. I guess that's what Joe is talking about, right Joe?
Blessings,
Barbara