A "PORN star" teacher could keep his job, despite a video of him having sex with an ex-student being posted on an X-rated website.
Just days before school resumes, the Geelong high school at the centre of the storm says it is taking the matter "very seriously".

The graphic video of the teacher and the student, who graduated in 2008, went viral on social media websites after students discovered it.

A preview video shows the couple naked, in sex acts, and with the girl blindfolded.

The ex-student explained yesterday that everyone who knew them understood the couple were in a committed relationship. The couple live together and jointly own a business.

"We're consenting adults," she said.

Oberon High School principal Alison Murphy said she took immediate action when she became aware of the video on Tuesday, but said the video did not change her view of the "successful" VCE teacher.

"He is not here today. It's uncertain when he will return," she said. "The matter is under investigation."