The film answers the question posed by its title: while a threesome involves three people physically, the emotional dynamics are rarely equal. There is no "I" in the sense of selfishness, but there is certainly an "I" in the sense of individual vulnerability. The documentary shows that opening a relationship does not remove problems; it amplifies them. It forces the couple to confront their insecurities, their need for validation, and the fragility of their bond.

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