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Around the world people have different rules for their relationships - rules often dictated by culture and religion. In many societies the most important of these is sexual fidelity - true love and monogamy are expected to go hand in hand - but why should love mean forsaking all others? And what happens to relationships when monogamy is cast adrift?

(Image of couples kissing and celebrating the eve of Valentine's Day. Credit: Getty Images)

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18 minutes

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Mon 26 Aug 2013 08:32 GMT

Why do we look the way we do?

Why do we look the way we do?

Tattoos, trainers, jeans, hair, ties ... why?

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