With four million Australians accessing pornography, The Australian Sex Party, says it has a real chance of winning seats in state and federal parliaments.

Its platforms include a national sex education curriculum, reducing censorship, abolishing the government's proposed internet filter and supporting gay marriage.

Party convenor Fiona Patten says the internet filter will put the Australian sex industry out of business in five years.

"It's (the filter) a real step backwards to where we've come. In fact it's far more censorial then we probably were 30 years ago," she told ABC Radio.

"Material that would be classified X-rated ... is considered illegal content and that is material that is currently available ... in newsagents."

"You will not be able to opt out of that block."

The new party would advocate a national sex education curriculum, something other countries were developing, Ms Patten said.

"There's so much concern about the sexualisation of children, children being exposed to material. I would have thought our first action would be education."

The party will be launched at the Melbourne Sexpo.