If zoo wasn’t taboo I think it would be a lot more openly practiced and talked about. Like maybe a pet’s sexual performance ability will be part of the discussion when buying a pet at the store. Brothels might have a wider species options beyond just humans of various skin colours and ethnicities. Adult stores would have a larger variety of dildo and vibrator shapes on their publicly viewed shelves and the same for cock sleeves and penetrators. Sex Ed would include animal and human interaction and biology might have a more detailed focus on animal reproduction. Maybe even open zoo porn mags on newsagent shelves.