"We're all just sitting there like, 'What the hell? What are we doing here? Why are we learning about animals having sex with humans?'" she said.

"It was really disgusting, it was really uncomfortable."

Following the incident, a government spokeswoman said the students had been offered extra counselling.

Headspace Berri's website states that it "provides free mental health services, alcohol & drug counselling, vocational support & some physical & sexual health services for young people 12-25 years old in the Riverland region of South Australia."