"There's definitely a lot of pressure for one guy."

Twins Anna and Lucy DeCinque do everything together. They were born together. They live together. They even date the same man together. For the past nine years, the Australian sisters have been in a three-way relationship with their partner (and as of late, fiancé), Ben Byrne. And now, the pair have decided that they want to become pregnant at the same time, and they both want Ben to be the father. Sharing their story to TLC's Extreme Sisters series, Anna and Lucy said that they decided to try and get pregnant at the same time when they figured out how to track their cycles. https://www.instagram.com/p/CXBN0MPBsqu/ "We learnt from the internet that when your temperature goes up your ovulating," Lucy said in a recent clip. Long known as the world's 'most identical twins' due to their cosmetic surgery habits, Anna and Lucy have spent upwards of $250,000 on a variety of procedures to resemble each other as keenly as possible. But now, they're turning all of their attention to a new goal - becoming parents with Ben at the same time. "There's definitely a lot of pressure for one guy," he said in the series clip. "It's a matter of multi-tasking I guess. Tap your head and rub your belly. Two things at once." https://www.instagram.com/p/CWne-CshOQg/ The teaser clip shows the twins lying in bed eating pineapple with their legs propped up against the wall, in a bid to get pregnant. The sisters have also said they are both eating the exact same diet - down to the exact portions of food - to ensure they both experience pregnancy at the same time. Doing everything together has been important for the twins since they were young. Anna previously told the New York Post that they don't even separate to use the bathroom.

"When she goes to the toilet, I come with her; when she has a shower, I come with her," she said.

"You name it and we do it. We're never apart. I don't think we'd function without each other. We have separation anxiety. We're bound to each other."