Married At First Sight's Ines Basic and Sam Ball have confessed their attraction for one another in a secret meeting hidden from their partners.

The pair arranged to meet after having dinner with their "spouses," with Ines greeting Sam with a kiss and a hug at the door of her apartment during Tuesday night's episode.

As he made his way inside, Sam couldn't resist taking another dig at his "wife" Elizabeth Sobinoff, telling Ines her wedding photo with Bronson Norrish was "better than mine".

"I bet it is," Ines said.

"It is," Sam replied.

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The pair sat on a couch together and both admitted they were sexually attracted to each other, with Sam stroking Ines' knee and briefly holding hands.

"It's so hard right because I think we would actually get along really well," Ines said.

"So do I, you're obviously more my type, I knew that already, it was pretty obvious," Sam said.

Both trashed their partners, with Ines claiming she and Bronson "butt heads" constantly while Sam said Elizabeth was "not ticking my boxes".

"She's like a walking megaphone, it's so annoying. I just couldn't deal with that," Ines added.

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They decided they should pick things up again at the dinner party but Ines joked they "can't like hook up" at the table.

"You come get me … what's the code word? Cupcake," Ines told Sam.

As they left Sam asked Ines to "leave me with a thought tonight".

"Can't I just send you nudes?" Ines asked.

Ines appeared the most taken with Sam, telling producers afterwards she felt "cute, soft and just happier" around him and he was "proper husband material".

Viewers weren't happy about Ines and Sam's deception, taking to Twitter to complain about their behaviour.

Married At First Sight continues Wednesday night at 7.30pm on Channel 9.