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Crystal Meth, GHB/GBL and Mephedrone form what some health workers call an "un-holy trinity" of drugs that together can heighten arousal and strip away inhibitions.

They have become increasingly popular on London's gay scene and the effects can see some users taking part in weekend-long sex parties, involving multiple partners.

For Radio 4's The Report, Mobeen Azhar speaks to men entrenched in this lifestyle and explores the impact the so-called "chemsex" scene is having on public health services.