The prospect of bare breasts on a Saturday is the last straw for Family First.
The lobby group is furious at plans for a Boobs on Bikes parade in Auckland, on the day the All Blacks play France in the Rugby World Cup.
Steve Crow is planning a "rugby special" Boobs on Bikes parade with girls body-painted in world cup team colours.
Family First says police and councils have been very liberal about weekday topless parades.
Spokesman Bob McCoskrie says having the parade on a weekend when many families with children will be in the city will cause widespread offence.