Seb posted a steamy picture of the scantily-clad pair sharing a kiss on Instagram to announce their exciting news.
“So Ania and I did a thing. O.F coming soon,” he wrote.
It wasn’t long before comments came flooding in about his ‘disappointing’ decision from his shocked fans.
Some fans accused the reality TV star of “cheapening” himself, with one angered fan writing, “No just NO! I thought much higher of you than this.”
“Yuck. Some things should remain private,” another added.
Not long after posting, Seb addressed the controversy and negativity from his fans.
“Hahaha I thought this might be a little conscientious. Sorry to shock everyone,” he started.
“I don’t see anything wrong with being empowered sexually with someone I’m close to, and hopefully empowering others to embrace a very important part of life.”
He explained that he hasn’t changed as a person, but just embracing a new life experience.
Addressing the backlash directly he wrote how upsetting it is that people are so quick to judge.
“It’s like having a favourite sporting team and dumping them after they lose a single game.”
Summing it up, he added, “In this case no one is being hurt and no one is being forced to explore this. Lots of love everyone.”
Former Married At First Sight contestant Cyrelle Paule was quick to jump to Seb and Ania’s defence.
Posting on her Instagram story, the TV personality wrote, “I don’t understand the world we live in.”
“When it was other MAFS contestants joining OFs we praised them, called them strong. Now a man does it but we don’t agree. Guess what, it’s HIS body, HIS choice.”
Seb’s fellow Season 7 Married at First Sight contestant Drew Brauer also jumped in to defend the personal trainer from the trolls.
“Experience all life has to offer mate, and don’t let the negative Nelly’s get in your ear.”
He also made a cheeky quip, “Let me know if you need a cameraman!”
Fans took to his social media, replying with positive comments and praise.
“Haters always gonna hate and they can bounce on! Hope you make a killing,” one person wrote.
"Who cares! What a bold decision, love it. P.s - what's the link?" another added.
One fan also referenced the Married At First Sight Olivia Frazer and Domenica Calarco nude photo scandal.
“Watch out, Olivia Frazer might come after you and Google you too!”
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at email@example.com.