They've been working on building their intimacy on Married At First Sight.

And on Sunday's episode, Belinda Vickers and Patrick Dwyer confirmed they've come a long way since their feet-clapping bath antics in week one, as they were grilled by sexologist Alessandra Rampolla during the commitment ceremony.

Belinda became very shy as she was asked what the pair got up to, before Patrick decided to crudely spill their X-rated activity to the group.

Belinda had said: 'There's other things in a relationship that you can do that's intimate, that lead up to having sex.'

'Such as?' Alessandra curiously responded.

'Exploring each other's bodies and seeing what we kind of... like...'

'In which way though?' Patrick chimed in, to which Belinda responded: 'Like, touching... I don't want to say it! Erm. I saw him, you know...'

After some encouragement from the room, Patrick brashly announced: 'Yeah OK, I got a h*nd j*b!'

After a sea of giggles, Alessandra said: 'That's beautiful!'

'Just come out and say it!' Belinda joked.

Alessandra then said to Belinda: 'I wonder how the relationship is for you now - having this experience, and feeling comfortable enough to go there with Patrick.'

The giddy dancer confirmed she now 'felt closer' to her husband, to which Alessandra advised: 'Build on the intimacy through sexual interaction.

'It's like you're a peacock and the feathers are out - and I do think that will help solidify the relationship.'

Married At First Sight continues Monday at 7:30pm on Nine