People: if you haven’t heard the term ‘throuple’ before, then strap on your figurative seatbelts on and get ready to learn.

It seemed like your ordinary love story.

Matt met Chris. Matt and Chris fell in love. Matt and Chris put a ring on it and became Mr and Mr Brandt.

They were living together, married for six years, and the rest could have been history.

Until Chris suggested they add another person to their monogamous relationship. And it wasn’t a man.

Instead, it was Cait, a 28-year-old woman who had just come out of a serious, five-year relationship with another man.

Introducing: the throuple.

L-R: Matt, Cait and Chris. Image via Barcroft TV.

Prior to their throuple-ness (no, it's not a word, but let's go with it), only Chris had been sexually intimate with a woman.

"At first Matt was completely opposed to the idea but after a while, we talked about it and he warmed up to it," Chris told Barcroft TV.

While Chris and Cait found the relationship easy to adjust to, both identifying as bisexual, it took longer for Matt to be secure with a woman.