Open House: The Great Sex Experiment

New couples move into the Open House. Chloe and Mark, who've only ever had sex with each other, open their relationship up to see if Chloe's attracted to women.

Jonny and Sarah have been trying to open up for two years but keep bottling it... can they finally overcome their nerves? And will Mark and Chloe's partners - Tanith and Paul - partake with others?

Claude and Amy want to form sexual and emotional relationships with multiple partners, but can Claude overcome his guilt issues? Jonny and Sarah have fallen for French lingerie model Marie

Alex and Alana want to open up, but can they overcome intense jealousy? And could an orgy be the best way for Jonny and Sarah to finally open up their relationship?

Tom and Lauren want to open up their relationship, but will Tom's stage fright stop him rising to the occasion? Alex's confidence is rattled after watching Alana have wild sex with resident Georgie.

The retreat's first gay couple, Chris and Simon, want to explore whether or not Simon is bisexual before they tie the knot. And will an orgy help Tom overcome his concerns?

Sharmayne and Jamie have little sexual experience with others. Can a high-energy social ease them into opening up? Plus: hot tubs and hesitation for Simon and Chris.

Jamie and Sharmayne still aren't sure how far they can go. And can seasoned swingers Ashley and Tanya take the next step and have sex with others, on their own?