'I can spot a cheater with one 60-second test. Here's how.'

This is an official warning to all cheaters…

Gone are the days of snooping through your phone or paying for a loyalty test to uncover your infidelity. Now, there is a much easier way to sniff you out. And it takes just 60 seconds.

"All you need to do is switch on to a reality television series where there's some cheating drama," personal development coach Felicity Morgan said in a video.

Married At First Sight, Love Is Blind, take your pick!

But before the frankenbiting and dramatic bass sounds suck you into the storyline, for this test to work, it's crucial your eyes don't stay glued to the screen.

"I want you to watch how [your partner] reacts when someone cheats," Felicity explained.

If they are "super aggressive and passionate", she said, this is a "strong indicator" that they have cheated themselves, as they are overcompensating to what is happening on screen.

"They're trying to make you believe that they would never do the thing that is on the TV," said Felicity.

"I'm not saying that if you don't like cheaters, that means you're a cheater. But when you are guilty of something, that part is living inside of you."

Watch: The 60-second test that exposes cheaters. Post continues after video.

The coach argued that a non-cheater's reaction would be "quite neutral" to the infidelity on screen, as they wouldn't feel the need to convince their partner of their loyalty.

"It doesn't mean they won't judge them, but they won't have an aggravated or passionate response," said Felicity.

"It's no different if someone says to you, 'I'm not a cheater' on the first date. I guarantee that they are," she added. "If we genuinely believe that thing doesn't live inside of us, we will never think that we need to convince people that we are not like that."

Speaking to Mamamia, Felicity explained that this cheating test came from "understanding shadow work".

"Ultimately, when we have suppressed parts of ourselves that we don't own, and parts of ourselves that we're really embarrassed about, or we don't want people to know, we will use other people and our reactions to hide what we do," said Felicity, who has coached over 10,000 people.

"What I've noticed, is that people that have the deepest impulses to cheat will often look and appear as complete saints."

Of course, this test isn't limited to reality television. There's nothing stopping you from plopping your man in front of Sex and The City to see if he squirms when Big cheats on Carrie.

But there is a reason Felicity thinks shows like Love Island and Too Hot To Handle yield the best results.

"I like using reality television because it's an exaggerated version of ourselves," she told Mamamia, explaining that the contestants are often edited to be a certain character: the villain, the girl next door… the cheater.

"It's always really interesting to see how people resonate with the characters," she said. "Who we demonise and who we like will, ultimately, mirror what we like and dislike about ourselves."

In this case, if the 'cheater' character elicits an "extreme level of disgust" from your partner, according to Felicity, it is very telling.

"When it becomes an emotional response or a character assassination, it's because [your partner] is assassinating themselves. They're reacting to the part of themselves that could do it."

This isn't to say that you should be throwing out accusations the minute your man calls out a wife swap in MAFS. But if their response seems disproportionate to the act on screen, Felicity thinks it could be worth a conversation.

"I would say something simple like, 'Hey, I'm noticing that you're having a pretty intense response to this person on TV. Can we talk about what's coming up for you right now?'," she said.

"If they start getting defensive as to why they are reacting in such an extreme way, that signals that they are defending the part of them that they don't want you to see."

She finished: "I always say, you never need to defend what you're not." 

Feature Image: Instagram/@iamfelicitymorgan