My girlfriend and I have a funny story. We eventually got into the habit of calling each other pup/doing petplay during sex.
She'd mentioned knotting and breeding, so I asked where she'd heard of those things. The bluntness of her words shocked me: "Doggy porn, of course!"
So I asked if she'd ever engage in sexual stuff with a dog, and she said no... apparently, that was a very silly question. She claimed to have only read dog porn, and was shocked I'd watched real stuff.
But that idea must've planted the seed. Some weeks later we talked about it again, and it seems she's converted to the right team. We've watched doggy porn together and started experimenting...