A mother has hit out at a "slut-shaming and victim-blaming" talk given to girls at her daughter's school, during which the students were told to measure their skirts and that their legs were "distracting" for boys.

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In a Facebook post, Ms Manning described how her daughter, whose school Kambrya College in Berwick, south of Melbourne, was one of 70 revealed to have been targeted by a pornographic website on which users solicit photos of girls and women, attended a meeting for female students in years seven to 10.

According to Ms Manning's post, the girls were told not to post photos of themselves online and to reject any requests from their boyfriends for "sexy selfies".

They were also instructed to check the length of their skirts and told "that anything that doesn't touch their knees or below by Monday morning would be deemed inappropriate".

"They were informed that this was to 'protect their integrity'," Ms Manning wrote.

"They were told the boys are distracted by their legs and that boys don't respect girls who wear short skirts.

"They feel their school has sexualised and demonised them, and compounded the problem by sending a strong message that it is them, the girls, who are responsible for the boys' behaviour, and that the boys are the victims here."

Mum 'surprised' by online reaction

Ms Manning's post has received more than 16,000 likes and has been shared more than 10,000 times since Friday afternoon.

She said she was "a bit surprised" by the attention, but that she had received plenty of support from fellow parents at the school.

"I think it resonates with a lot of people," she told the ABC. "Most girls and women have been judged based on their clothing."

She said she had received plenty of support from school parents and students, as well as those commenting on the post.

"Every time there is someone [commenting on the post] who doesn't get it and I'm about to politely re-explain, another comment pops up from another awesome warrior who's on to it. It has been wonderful."

She said she was proud of her daughter and her friends for standing their ground.

"It's one of those things that as soon as you speak up about this, it's a common tactic ... that it's then fobbed off as 'you're making a mountain out of a molehill'," she said.

"This is a serious thing that women face every day, and not just at school — it's a societal attitude problem."

School could send great message: mother

In a statement, the school said the assemblies had been about "dress code, sexting, social media and respect".

"We chose to separate boys and girls and different years to create smaller groups and encourage open dialogue," assistant principal Jo Wastle said.

"We also used this assembly to discuss our school being named in recent reports about a website which allegedly contains indecent images of girls from schools across Australia. As far as we know none of our students were affected, but they had heard about it and we wanted to set their minds at rest."

The school's dress code mandates that skirts should be worn on or below the knee.

Ms Manning said she had not personally been contacted by the school, despite making phone and email complaints about the assembly prior to posting on Facebook.

"Had they just said, 'Oh yes, we can see the girls' point, we're sorry that we made them feel that way, let's see if we can fix this', that would have sent such a great message," she said.

"But instead, they've turned it into an uncomfortable situation for the girls."