Dr Trish Stratford is best known to New Zealand audiences as one of the three experts on Married at First Sight Australia.

She joined Simon Barnett and Phil Gifford to discuss the latest season of the contentious reality show, which sees strangers coupled together without having ever met before.

The show has been dogged with rumours for years that it's all constructed, but Dr Stratford, one of the three people who pairs the couples together, told them that it is not scripted at all.

"It's not staged at all. It's unscripted television. We out them together, and then we put them into the experiment, and as extraordinary as it seems, the experiment takes over."

She says that the people change once they are in the pressure cooker of the experiment. 

Only three couples are currently still together from the six previous seasons, but Dr Stratford says that many of them remain friends.

"Everyone who is on the program say that they've learnt about themselves. So to me, that's a success anyway."

One of the key problems that contestants face on the show, she says, is that they tend to bring their own issues with them and struggle to change.