Queensland Opposition MP John-Paul Langbroek will repay taxpayers for accommodation costs in his electorate, after using his sister's radio program to say he was aghast at suggestions of extra marital misbehaviour with prostitutes.

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The Member for Surfers Paradise claimed more than $800 to stay overnight three times last year at charity events near his Gold Coast home.

In a statement, Mr Langbroek said he had written to the Clerk of the Parliament.

"In the interests of being accountable and transparent ... I will be reimbursing the accommodation claims made within my own electorate.

"All claims were made within parliamentary guidelines and assessed by parliamentary officers."

On his sister Kate Langbroek's Australian Radio Network program, Mr Langbroek said there was no differentiation for accommodation costs between small and large electorates, as there was for car allowances.

"It's weird — when you have car allowances they give you a different level depending on the size of the electorates, but they don't for hotel stays," he said.

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"For the first 10 years I was in, you couldn't do it. And then they said you can. They changed it for everyone."

The interview took a strange turn when Kate Langbroek referred to social media comments about her brother's behaviour.

She told the audience Mr Langbroek had been with his wife, Stacey, "and at the time it didn't even occur to me that it was hookers!"

"It's not hookers," Mr Langbroek chimed in vehemently.

"Where does that come from? We were at three charity events together."

Mr Langbroek said: "Really sorry to people who have felt it was the wrong thing — even though, according to our rules it was OK.

This prompted his sister to chide him:

"Oh that doesn't sound like you're sorry, that actually sounds like a justification. Don't use that tone, apologise again."

Which Mr Langbroek did: "I'm sorry and I won't do it again."