Fox says many people in such close three-way relationships say that their communication skills are greatly enhanced by the process of discussing their thoughts, plans and feelings with more than one partner.
Around the world, an increasing amount of loved-up folk are choosing to live in a “throuple”.
“A throuple is an intimate, loving, equal relationship between a trio of people,” explains journalist and sex educator Alix Fox.
Previously speaking to The Mirror, Grant said Tran was different to anyone he and Curran had ever met.
“There was something about him that Shayne and I couldn’t explain, but it was like meeting our life partner for the second time,” he said.
Curran added that the pair had never been in a three-way relationship and the new territory was a little scary at first.