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Watch the BBC first on iPlayer https://bbc.in/iPlayerHome Pleasure is vital for our survival without it we wouldn't eat or have sex, and would soon die out as a species. But how does pleasure work and what gives us the most pleasure in life?

In an attempt to find out, Michael Mosley learns how the hottest chilli in the world creates euphoria in the brain, why parents have an overwhelming surge of love for their newborn child and what happens if you turn your own wedding into a chemistry experiment.

When faced with the option to cut off his own arm or face certain death, Sampson Parker chose to live. Here he tells his incredible story, and reveals that his love for his wife gave him the strength to bare such immense pain.

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