'He treats us equally': Identical Aussie twins Anna and Lucy explain how their relationship with shared fiancé Ben works after 11 years together

Aussie identical twins Anna and Lucy DeCinque's likeness extends to every part of their lives – their clothes, mannerisms and even shared fiancé Ben who they've been with for 11 years.

In Season 2 of Extreme Sisters – which you can watch for free on 9Now – the Perth sisters explained just how the throuple manage to keep their intimate relationship "even".

Stream episodes of Extreme Sisters for free on 9Now.

"There's never been no jealousy in this relationship," the 36-year-old sisters said in unison.

"Ben treats us equally, he will never kiss Anna and not me," Lucy detailed.

Watch Anna and Lucy explain their relationship with Ben in the video above.

"He just knows if he's ever going to kiss me he's going to kiss Lucy straight away, he just knows to and from day one it has been equal," Anna added.

Anna and Lucy made the relationship revelation to their hairdresser while they were both getting a haircut.

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Of course, the hairdresser was visibly shocked by Anna and Lucy's lifestyle exclaiming, "It's f--king crazy!"

She wondered how Anna, Lucy and Ben navigated their intimate relationship.

"Do they really have sex with the same guy at the same time?"

You can watch the hairdresser's reaction to the bizarre revelation below:

Anna and Lucy, who claim to be "the most identical in the world", wish to marry Ben but can't because it's illegal in Australia.

"If we could we will marry Ben, if it was possible," Lucy says.

"There really shouldn't be a law. It's totally unfair, we're being judged," Anna continues.

The twins don't want the law to stop them from taking the next step in their relationship with Ben and are looking at going overseas "to celebrate [their] love together."

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Anna and Lucy met Ben through social media.

After six months of talking, the twins realised they both liked him. By then there was only one solution: "Should we just share him then?" they explained in a previous episode.

"Sharing a boyfriend for us means we get to be together all the time," Anna said.

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Anna and Lucy's next goal is to fall pregnant at, you guessed it, the same time.

But visits with fertility professionals have made the twins realise that dream may not be possible.

You can find out what happens and follow their fertility journey in Season 2 of Extreme Sisters out now.

Stream episodes of Extreme Sisters for free on 9Now.

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