Sorry Anna, but I will resort to a Limerick - if only for the raeson that the subject is directly related to the pub that I have just left - The 'Lincoln' off Trinity College. Our famed bard (one of many) - Oliver St John Gogarty - was a regular there and he is said to have penned this verse (apologies to those with feint hearts):

There was a young man from St. Johns
Who wanted to roger the swans
'Oh, no' said the porter,
'Oblige with my daughter
but the birds are reserved for the dons'.

ba-boom.