"Offensive" hay bale sex sculpture ?

We are slightly confused as to why this is considered to be "publishing pornographic images"?

 

A farmer who built a hay bale sculpture of a bull having sex with a cow has refused to take it down after police told him he could be charged with ‘publishing pornographic images’.

Bruce Cook, who owns Kactus Point Charolais near Kerang, Australia, built the sculpture on Good Friday as ‘a bit of fun’ but was ordered by police to take it down after someone complained that they found it offensive.

 

Mr. Cook flatly refused the order, however, telling the police officer to ‘p*** off’ and saying he will now light up the sculpture at night so passers-by can see it for longer and more clearly. He is also considering adding calves to the sculpture.

 

‘I couldn’t believe it,’ he told a popular new publication.

 

‘How could anyone be offended by something that happens out in the paddocks for real every day of the week?

 

‘They have picked on the wrong person. I don’t care what they threaten me with. The sculpture stays.’

 

Mr. Cook insists he is not angry that someone complained about his sculpture, just baffled that anyone could find it offensive.

 

‘It’s just a stack of hay bales,’ he said.

 

What do you think? Is this "publishing pornographic images"