Coalition ministers and MPs are again questioning the Prime Minister's judgement in the wake of a marathon party room debate on same-sex marriage which extinguished the hope that Liberal and National MPs might get a free vote on the issue.

The meeting ended in a resounding victory for those arguing to keep the status quo.

After the meeting Prime Minister Tony Abbott said there was strong support among his MPs for maintaining the traditional definition of marriage.

"It was roughly 60:30, 60 supporting the existing position, 30 saying there should be a free vote," he said.

"Now, of the 30 that said that there should be a free vote, quite a number, half a dozen maybe, said that if there was a free vote they would still support the existing position."

The Prime Minister has said the Coalition will see out this term supporting the traditional definition of marriage.

But he said in the next parliament MPs will either get a free vote or the public will get to vote on the issue.

"I've come to the view, I believe this is the party room view, that this is the last term in which the Coalition party room can be bound, although we will definitely maintain the current position for the life of this term," Mr Abbott said.

"Going into the next election, we will finalise another position.

"The disposition of the party room this evening [Tuesday] is that our position going into the next election should be that in a subsequent term of parliament, this is a matter that should rightly be put to the Australian people."

Outcome shows party room disconnect: Coalition MP

LNP MP Warren Entsch said his same-sex marriage bill will be introduced to parliament on Monday, but accepts it will not pass if put to a vote.

"I can confirm that the bill will be introduced on Monday morning when I intend to highlight some of the very personal and heartfelt stories that have led me to take this path," he said.

"I have to concede however that given [Tuesday]'s decision, the likelihood of failure - should it come to a vote - is assured."

Mr Entsch also said he was not "angry" about the outcome from the six-hour meeting.

"While I'm disappointed with the outcome, I am not angry and I accept the decision of the Party Room."

A Coalition MP said "(The outcome of the meeting) proves the disconnect between some ministers and the grassroots and why we are having such problems."

Liberal Councillor and Mr Abbott's sister Christine Forster, who is engaged to a woman, said she was very disappointed with the result of the party room meeting.

"I'm feeling very disappointed and ... I fervently wish the vote had gone the other way," she told Lateline.

"For me it goes to core Liberal principles [by] which we are all equal before the law.

"It's my view ... that our Liberal MPs, our Coalition MPs ... should have been given the opportunity to vote with their consciences on this.

"They could all stand on their principles and look their constituents in the eye and say 'I voted this way because that is how I believe, that is my personal belief'."

Queensland LNP MP Andrew Laming said he argued strongly for a conscience vote.

"There is a very strong and emerging current for this to be revisited, but it won't be happening in this election term," he said.

Fellow Queenslander George Christensen was pleased with the result.

"I'm very happy with where we've landed on this," he said.

"It was robust in some respects, but also very healthy and everyone was very respectful."