Married at First Sight star Iris Caldwell has been portrayed as a modest and reserved woman, but she's letting the world know there was always a part of her ready to get a little kinky and, in fact, her desires for intimacy were ready to boil over at one point in her marriage to Keith Manley.

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During Married at First Sight: Unfiltered's August 21 broadcast, Iris watched back a Season 9 clip in which she and Keith licked edible body paint off each other -- from Iris' neck to her leg.

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The steamy exercise was one of MAFS expert Dr. Viviana Coles' suggestions to get the ball rolling on their physical intimacy and spice things up a bit in the bedroom.

"I felt comfortable doing that," Iris said of the body-paint activity with Keith on Unfiltered.

"That was something where I could place it where I would like to or place it where he would like to, where we were both in control of that. To me, that dice game was telling us things to do. I want things to be very organic."

Keith had accused Iris of being sexually immature after playing a dice game with her in which they had to execute what they were being instructed to do.

For example, Iris was asked to lick Keith's toes, and the activity turned out to be awkward and Iris refused to play along.

Married at First Sight viewers were therefore probably surprised to see this new, sensual side of Iris given she had joined the show as a virgin with many walls up, but Iris insisted her moves during the body-paint activity were no grand departure from her usual behavior in a relationship.

Iris was then asked how it felt to open up to Keith more physically.

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"It felt good! I've always had it inside of me, like, that's what y'all are missing! I've always had that. It's literally just, like, what exactly is it that is going to bring it out? Or what activity? Or what are we going to do?" Iris explained.

"That's been ready to, like, boil out of Iris for a while!"
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Iris' Married at First Sight co-star Jamie Thompson then blurted out with support, "Alright!"

After Iris acknowledged "Keith enjoyed the exercise," Jamie admitted he had never seen her so intimate with Keith before.

"This was a first for me!" Jamie said. "I was just like, 'Who is this girl?!' Congratulations!"

"I've got it!" Iris responded with a big smile, before reiterating, "It's always been in here!"

"You just had to let it out," Jamie agreed.

Matthew Gwynne, who also stars on Married at First Sight's ninth season, also seemed surprised by Iris taking such initiative in her marriage to advance things with Keith.

"I was surprised. I'm proud of her!" Matt said. "I'm happy for her."

When Iris and Keith reached this new level of intimacy in their relationship, she revealed her nerves about losing her virginity were diminishing.

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"Are you less anxious about having sex with [Keith]?" Unfiltered host Jamie Otis asked Iris.

"I think so!" Iris replied. "Like again, this was on our own terms. This was something that me and him have created for ourselves together that we kind of ease into, you know, whatever happens with us!"

Earlier in the Unfiltered broadcast, Iris also said she feels Keith's belief that she's not sexually mature is invalid and basically ridiculous.

"That to me is so baffling!" Iris said after viewing a Season 9 clip that showed Keith telling Pastor Calvin Roberson he wasn't quite sexually attracted to Iris yet due to her alleged lack of sexual maturity.

"I don't think it's valid for him to say that I'm sexually immature based off of a dice game. I don't know why he just hasn't said any of this to me yet."

"We need to have a conversation about how you're really feeling, Keith, because right now, you're closing me out of being able to fix this marriage," Iris vented on Unfiltered.

Iris' Married at First Sight co-star Matt had also blurted out his opinion on the topic.

"It's crazy to me how much everybody says to the experts but doesn't say to their partner," Matt suddenly interjected.

"It really is," Iris said.

Married at First Sight's currently-airing season also stars Elizabeth Bice, Amber Bowles, Deonna McNeill and Gregory Okotie.

RELATED LINK: 'MARRIED AT FIRST SIGHT' COUPLES NOW: WHAT COUPLES ARE STILL TOGETHER? WHO BROKE UP? (PHOTOS)

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