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Watch Open House: The Great Sex Experiment Season 1 Episode 1 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

In this first episode, Welsh sweethearts Mady and Nathan are interested in bringing another woman into their relationship, a process that begins by having a threesome. Also keen to open up their relationship are married couple Jon and Danielle from Bolton. They're interested in having group sex, but are unclear whether this will help overcome the demons of their past.