Teenage Queensland ALP candidate Peter Watson has been expelled from the party after admitting to a series of anti-gay rants on the internet.

Mr Watson was forced to resign as Labor's candidate for the Southern Downs electorate last night, after linking homosexuality to paedophilia in website postings made around four years ago.

This morning, the ALP said in a statement Mr Watson had also been expelled from the party.

The 19-year-old admitted to ABC Radio's AM program earlier this morning that he did write the posts.

"I said that homosexuality and paedophilia were linked because there's been some research done ... and it's been published by the Catholic Church, that suggests that 30 per cent of male paedophiles are homosexual," Mr Watson said.

"I made the comments, so I do agree with it.

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"These comments I made about homosexuals were made when I was like 14, 15 years old, so we're talking about four, five years ago.

"[But] I do agree in some sense.

"Research - and it's been published by the Catholic Church - that suggest that 30 per cent of male paedophiles are homosexual."

Mr Watson's posts also described homosexuals as "social degenerates" and accused them of destroying society's values.

"They do - in a sense homosexuality does degrade our society's values," he told AM.

Mr Watson said an initial denial in a statement from the ALP last night was issued because at the time he was not "actually aware of what allegations people were talking about".

Mr Watson also explained how he got the party nomination.

"A person from the party office in Brisbane came to Warwick," he said.

"We held meetings and there were only two people who put their hands up. Then she dropped out, and I was the one that got the nomination.

"A person went to my house. We had a bit of a chat and then I just filled out a few forms and that was it."

Labor's state secretary Anthony Chisholm had said in an earlier statement that Mr Watson had denied the allegations to party officials.

"That's what he told our officials at the time, clearly he has had a change of mind on those matters," he said.

"Clearly the decision to ask for his resignation was the correct one."

'Unacceptable opinions'

This morning the ALP expelled Mr Watson, with Mr Chisholm saying the Labor Party could "not tolerate these types of extreme views".

"When Peter Watson was endorsed as the candidate for Southern Downs late last year, we were unaware of his extreme and unacceptable opinions," he said.

"Late yesterday, Peter Watson maintained to party officials the allegations against him were false.

"Now he has admitted to being the author of this material, the party has acted swiftly in response."

Queensland's Deputy Premier Andrew Fraser says Mr Watson kept his views from party officials.

"Clearly if we had have known about these things then he wouldn't have been the candidate," he said.

But the Liberal National Party (LNP) says Labor should be embarrassed about endorsing Mr Watson.

LNP MP Lawrence Springborg, who Mr Watson was standing against, has questioned the ALP's screening procedures for candidates.

Mr Springborg says a simple Google search would have uncovered Mr Watson's views.

"What checking did they do when anyone could go out there, blind Freddy could actually find this particular information - it was out there for all to see," he said.

"Labor were actually denying it as late as last night."

Out of date

A leading gay rights activist has welcomed Mr Watson's expulsion from the ALP.

Shelley Argent from the Parents and Friends of Lesbians and Gays says that was the right thing to do.

"His views on homosexuality are just so wrong, and also his views on being a white nationalist or whatever he likes to call himself, again are just so wrong and just so out of date that I don't think any party needs him - LNP or Labor," she said.

Labor is now using the controversy to pressure LNP leader Campbell Newman to sack his candidate for Cairns in the state's far north.

LNP candidate Gavin King once wrote a newspaper column suggesting that women who drink to excess are partly to blame for sexual assaults.

The State Government says Labor has acted decisively in sacking Mr Watson over his extreme views and Mr Newman should follow suit.

But Mr Newman says Mr King is a good person.

"He has apologised for an article he wrote about four years ago where he made some comments which were actually about warning young women about their personal safety," he said.

"Instead we have today a situation where someone in the Labor Party has made totally inappropriate comments that everyone should reject."