Those coming out to watch the Boobs on Bikes parade are those most likely to need help, says a health professional running a program treating sex offenders.

Russell Smith says those standing on the kerb watching the parade are likely to have a problem with pornography.

Mr Smith offered his view before leading a protest march against pornographer Steve Crow's Boobs on Bikes parade. He also offered thanks to Crow for creating a situation which highlighted those most in need of help.

"The very people coming out today are the people we want to reach."

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The parade is used to promote the sex-related businesses of Mr Crow is being preceded by a protest march organised by the advocacy group Stop Demand Foundation.

It will see the Men Against Sexual Violence group march with sex offender clinicians and a Kaikohe community group take a stand on Queen Street just 15 minutes before Crow's porn promotion rides down the street.

Stop Demand founder Denise Ritchie said it was an opportunity to raise issues around pornography, which featured in both the parade and the three-day Erotica Expo which it was promoting. "Both events are using international porn stars as a drawcard. The organiser is a renowned pornographer."

Russell Smith, a sex offender clinician at Korowai Tumanako, said porn was used by sex offenders and increased the level of their arousal and the harm caused.

"We know that some of the offenders have forced their partners into committing sexual acts that they see in pornography, without consent, and try to minimise that harm. Porn has a way of affecting the developing mind like no other drug."

It's four years since the Boobs on Bikes parade has been seen on Auckland's streets - and it has never drawn crowds to match its peak audience about a decade ago. Crow has since tried to take the parade regional, also to dwindling crowds.

Crow's business ambition took a hit after he was banned from acting as a company director and then fined for ignoring the ban. The four year ban was imposed in 2010.

A few thousand people lined Queen St to watch about 30 Harley Davison motorcycles carrying topless female pillion passengers.

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The parade was led by Crow, who was revealed to have discussed the coinciding parades for and against pornography with anti-porn protester Denise Ritchie.

Ms Ritchie told the Herald she met for coffee with Crow last week and the pair texted each other this morning.

She said the crowds for Boobs on Bikes created a "perfect" opportunity to highlight the anti-porn message.

The two groups met at the bottom of Wyndham St in a brief face-off, which had Crow produce ear-shattering revs before continuing down Queen St.

Crow's trip down Queen Street was done so quickly few would have had more than a glimpse of the porn actors he shipped in for his Erotica Expo this weekend.

The roar of motorcycles had many on the route wincing in pain and clutching their ears while the speed had Crow's porn parade meet up with the protest before the bottom of Queen Street.

The meeting of the two groups saw Crow slow down as photographs were taken of his parade against the backdrop of protest signs.

"Did you see me go out and shake his hand?" asked Ms Ritchie. "It was a winner for us. We had an audience to get our message to."

Ms Ritchie said it was "not about personalities" but about the issue of pornography. She said she had met with Crow for an hour-long coffee after a meeting between police over traffic issues and talked to him about the harm pornography did.