Sam Frost's boyfriend Sasha pranks her on the radio. Quickly takes it too far.

Sam Frost received a rather unusual call to her radio show on Wednesday morning.

In a segment titled, ‘Confessions of awkward erections’, Frost and co-host Rove McManus took a call from a man called Pete from Dural.

But as soon as ‘Pete’ began it became clear it was actually Sasha Mielczarek on the line.

The call which seemed harmless at first, escalated to offer listeners an intimate behind-the-scenes look at The Bachelorette.

"So I was on this dating reality TV show once upon a time and we are in New Zealand in the back of the boat, having a good time Sam and I," Mielczarek said

"Blanket on top of us and, look, it must have been the wind the way it was going but, look, I only got half a bar."

At this point, Frost loses her composure, throwing her head back in laughter.

"But then the worst thing about it, was they were like "all right, let's cut this set and let's go to the next one," Mielczarek said.

"I'm sitting there in the back of the boat and I'm going, 'I can't take this blanket off, there's no way.'"

The story renders both McManus and Frost unable to respond with anything other than looks of sheer horror and delight.

"So I had to do a quick readjust, all the boys will know what I'm talking about here, and tuck it on the inside of the belt until it goes back down. And then away I go. No one is the wiser," he said.

The call comes only one day before Mielczarek spoke to the Daily Mail about the criticism Frost has been receiving on social media for her weight loss.

"I look at the comments and I just laugh because these people are hiding behind a phone or hiding behind their computers writing the mean comments," he said.

He went on to clarify the criticism would be taken differently if it were directed at the radio host's face rather than her body.

"At the end of the day it is just water off a duck's back to her and I," Mielczarek said.

The comments were initially sparked by bikini photos Frost had posted to her Instagram account.

Long weekend with my sister ☀️

A photo posted by Sam Frost (@fro01) on Mar 24, 2016 at 9:37pm PDT

Frost then shared the criticisms on her morning show at 104.1FM, reminding audiences of who those kinds of words can impact the most.

"People were saying I looked disgusting and gross and that I was a bad role model because I'm so thin...(and) that I've clearly got an eating disorder," she said.

"I've got young girls following me and I like to think that I'm a good role model. For them seeing comments like that - I don't think it's helpful."

Frost's criticism comes as a stark reminder of how public attacks around body image affect not just the target but all those who stand to witness.

And considering Frost's 414 thousand followers, that's a very large body for these bullets to ricochet.

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