“So, let’s talk about porn,” says Ethan West to the classroom of Australian teenagers. Most look slightly awkward. All are uncharacteristically quiet.

“Do any porn videos start off with a relationship where the actors talk about feelings or consent?” he continues. More silence.

At Kellyville High School, north of Sydney, this is just one tricky conversation the 15-year-olds will be having today.

From sexist jokes and coercive control to sexual assault and brutal jealousy-fuelled assaults – there’s not much off limits on the Love Bites programme which national charity Napcan has delivered to thousands of students.