For her trouble, Tankard Reist got some hate directed her way.
"I think that rape's fun," said one tweet featuring an image of the 51-year-old mother of four, who does not shirk from giving it back to those who cross her path. She retweeted the message to reinforce her conviction about the rapper's malign appeal.
Another big target Tankard Reist would like to confront is Amazon.com. She says the online giant stocks titles which "normalise and eroticise child sexual assault" and says access to this material helps "drive the trade in children's bodies".
But the loathing directed at paedophiles stopped short of repulsion against the industries which profit from the sexualisation of children.
From Adelaide, where this week she was on a high school speaking tour, Tankard Reist said: "One of my arguments is we condemn sexual abuse and we put people in jail for crimes against children. But we don't look at the culture where permission is given to men who want to do these things." An Australian carmaker is currently offering "five hot nights in Bangkok" as a promotion to sell a new model and "girls are posed and styled in advertising in ways that makes them sexually interesting and available".
Tankard Reist - whose name sometimes appears in articles as "MTR" in the style of "SBW" (Sonny Bill Williams) - argues that "we get to this point because we allow it. We have magazines next to the lollies in corner shops which promote sex with girls. Retail chains sell sexualised clothes for girls".
At fast-food stores and gas station retail outlets, glossy mags celebrated "barely legal" girls in pigtails and teeth-braces "wanting to be vio-lated" - a trend she calls the "Lolitaisation" of Australian culture.
Tankard Reist is here next week as a guest of Christian charity Tear Fund for a series of public meetings. Her topic is sex trafficking, which she calls the "21st century slavery" and is fuelled, she asserts, by the sexualisation of women and children.
"The problem," says Tankard Reist, "is that the culture is toxic to young people and especially to girls. All the research is telling us that".
The evidence she cites from Australia includes children as young as 4 being referred to programmes for problem sexual behaviour. A children's hospital service in Melbourne dealt with 350 cases last year - double that of the previous year. Half of the children referred abused siblings. A common element was exposure to pornography, with the behaviour often extreme because of what children could access online.
Girls had told Tankard Reist that boys expected them to provide a "PSE", or porn-star experience. Boys, on the other hand, felt that girls would deliver every X-rated image they had seen and that girls wanted that.
Data about teens suggested 90 per cent of boys and 60 per cent of girls were exposed to pornography before they turned 18, with their first encounter occurring as young as 12.
With the internet awash in porn, it was little wonder that mental health problems and reports of self harm were rising among children, that kids were withdrawn and failing at school, and girls' self-esteem was eroding.
So what can be done to resist the US$100 billion ($154 billion) porn industry?
"We need more political commitment," she says. She believes only governments are powerful enough to confront the pernicious messages of porn that undercut the ability of boys to form respectful and healthy relationships.
"The message I'm bringing is that we can challenge the porn business and address the issues that see women and girls used as human fodder to feed the global sex industry."
The strikes against Zoo and rap star Tyler were small, but significant, steps which got Collective Shout global attention. "We'll keep chipping away," she promises.
Staying safe
Advice from Melinda Tankard Reist:
• Act personally: know what your kids are watching at home
• Use blocks: set up parental controls to filter websites
• Keep talking: let your kids know you want to hear from them
• Get political: tell MPs that we don't want kids to access torture porn or rape porn
The Australian activist is on a speaking tour from September 4-9. Details at www.tearfund.org.nz/melinda-tour/
