Topless porn stars pass a large crowd of onlookers during the Boobs on Bikes parade of topless women down Queen Street to promote this weekends Erotica Adult Expo in Auckland.

A parade of 20 topless female porn stars on motorbikes brought the centre of Auckland to a standstill as crowds craned their necks for a glimpse in the noon of Aug 23.

The Boobs on Bikes parade went ahead despite Auckland mayor Dick Hubbard labelling the promotion for an erotica show as morally repugnant.

The porn stars in studded knee-high boots, black leather pants and little else travelled in a convoy down the citys main thoroughfare Queen Street.

A mostly male crowd wielding camera phones and video cameras massed along the street as two armoured ex-military vehicles and motorbikes carrying 20 topless women and a few men drove by.

A furore over the parade -- which has been held for the last several years in New Zealands largest city -- brought out the biggest crowds ever for the spectacle.

Parade organizer Steve Crow had applied to Hubbards city council for a permit to hold the parade but was turned down at last. However, the spectacle could not be stopped because there is no law against women baring their breasts in public.

The only way they could legally stop it would be to change the constitution of New Zealand and remove womens rights to bare their breasts in public, Crow said.