The Education Review Office says high schools should be teaching about pornography and sexual violence so teenagers learn what's healthy and what's not.

The agency, in its first review of sexuality education in schools since 2007, says schools have not kept pace with an explosion of access to pornography and other sexual content on smartphones and social media.

"To meet the needs of young people in our current context, sexuality education needs to be more comprehensive and the variability across schools needs to be reduced," it says.

"This evaluation found some schools were failing to meet minimum standards of effectiveness, and many more were only just meeting these standards.

"Given the complexity of the issues involved, and the impact sexuality issues have on young people's wellbeing, this performance is not good enough."

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