Pornography is now so freely available that boys as young as seven have access to it and there is no way for parents to prevent that, White Ribbon campaign organiser Rob McCann said.
As a result, hospitals are seeing girls who are having sex too young and becoming incontinent. And some boys are unable to get erections when sex doesn't measure up to the violent and "way out" pornography they consume.
"As parents you can't stop your children having access to this anymore, because the internet is absolutely everywhere and young people will tend to be one step ahead of their parents," McCann said.
There's a massive addiction to pornography. He's heard of young men who would rather stay at home and watch porn than go out with a real person.
Research on New Zealand fathers has found they are unlikely to talk to their sons about respectful sexual relationships, yet they talk to their daughters about keeping safe.
"Don't wait until your sons are 15 or 16. They've already had years and years of watching these things by then," McCann advises.
Men can take the White Ribbon pledge online, and those committing to talk to young men will be sent information on the best way to do so.
Other actions men can commit to include disrupting other men's violence against women, treating women as equals and talking to young men about breaking out of the "Man Box".