VIEWERS of The Great Sex Experiment were left cringing after a couple had a disastrous threesome live on TV.
Channel 4 has billed its new series - which launched on Friday night - its "most shocking show ever" as it puts poly-curious couples to the test.
Across six episodes, the couples are invited to explore and indulge in their fantasies in a luxury stately home, with an expert on hand.
Intimacy therapist Dr Lori Beth will provide them with support and advice on how to open their relationships safely and healthily.
The debut episode saw Mady, 19, and Nathan, 25, head to the mansion in order to try out their first threesome, live on air.
The couple said they were keen to see if "it would suit them" to be in a 'throuple', and therefore wanted to try an experience with a third person.
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Mady and Nathan invited resident Precious back to their bedroom after a night of erotic games - but it didn't all go to plan right away.
Dressed in lingerie, Precious headed to the bedroom with the couple before quickly getting down and dirty with Mady.
Snuggling up under the covers, things started to go south when Nathan admitted that he "wasn't hard" despite having two women in his bed.
"Are you hard?" Precious asked him, to which he quietly replied: "No."
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His girlfriend Mady quickly suggested her boyfriend "watch" her and Precious have sex to "turn him on" in preparation for their threesome.
"As the night went on I ended up being a bit of a spare part," Nathan told the cameras as he was seen trying to get involved.
He soon clocked out of the experience, leaving Mady to suggest that he "felt in the bath", leaving Nathan feeling "pissed off".
"What have I done?" Mady could be heard asking after Precious headed off to sleep, with Nathan replying: "You've made my first experience a bad one.
"You made me feel like a spare part. Well you've f***ed it now."
While the couple had success on their second attempt - with resident Grace - viewers were left shocked at the disastrous threesome.
One wrote of the awkward moment: "This is the most uncomfortable I've been watching a TV show."
A second chimed in: "It’s so cringely good," as a third wrote: "Nathan should have packed some little blue besties. Awkward."
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Others were just pleased it worked out for the couple, writing: "I’m glad it worked out for Nathan and Maddie, their first match seemed a bit rushed, the second more considered."
Elsewhere, on the show, couple Jon, 37, and Danielle, 35, tried out their first orgy with another resident couple.