Here in Copenhagen we have a street with a lot of porn shops. I saw one of those sheep hanging in the window of a shop at least twenty years ago.

It reminds me of a joke I heard a lot of years ago:

The vicar of the small Irish town had become ill, and the town council had hired a substitute to conduct the service while the vicar recovered.
The substitute vicar drove in his car towards the small town and passed a field where he saw a man fucking a sheep. The vicar didn’t believe his own eyes and was shaken to his core. However he continued and passed another field where he saw another man fucking a sheep. If possible the vicar was now even more shaken but he continued towards the small town. Then he passed yet another field, and here he saw a man masturbating. The deeply shaken vicar continued and arrived at the small town. Here he was welcomed by the Mayor. The vicar said to the Mayer: You probably won't believe what I say, but on my way here I saw a man fucking a sheep, and further down the road I saw another man fucking a sheep. Yes, the Mayer answered. And the vicar continued. "Then I passed a field and saw a man masturbating. It is a sin and it is terrible and tragic". I quite agree, said the Mayer, it is Macgregor, he is too old to catch a sheep.

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An afterthought:
Perhaps it is an Irish invention designed for men who are too old to catch a sheep?