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The term 'chemsex' refers to the growing trend of using powerful disinhibitors like crystal meth, GHB and mephedrone, especially within the gay community.

The drugs increase the desire for sex and reduce sexual inhibitions but can have serious health consequences.

The practice has been highlighted following the high-profile case of Henry Hendron, whose 18-year-old boyfriend Miguel Jimenez died of an overdose.

The Victoria Derbyshire programme looked at that case and spoke to Daniel May and Greg Owen who both have experience of chemsex and Hannah McCall, a specialist sexual health nurse at Central and North West London NHS Trust - she recently wrote an editorial in the British Medical Journal saying chemsex needs to become a public health priority.