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Can the rulebook on relationships be rewritten? Louis Theroux takes a look.

Stream Louis Theroux - Altered States - Love without Limits on BBC Select

Love and marriage. Do they still go together like a horse and carriage – or is the model no longer fit for purpose?

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Louis Theroux: Altered States - Love Without Limits on BBC Select

British filmmaker Louis Theroux visits ‘US capital of polyamory’ – Portland, Oregon – to meet the couples opening up their relationships in eye-opening ways. For many, more partners means more love and happiness – but for some, he finds, it means jealousy, upset and broken hearts.

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