The Highs And Lows Of Chemsex's Drug-driven Orgy Scene

'Once a month, sometimes once a week, a guy collapses and we have to call an ambulance' (Credit: AFP)

David is a psychologist and has been taking part in drug-fuelled gay orgies for the past 15 years.

"The sex is crazy -- utterly unbridled -- which of course is partly down to the drugs but also because you can act out all your fantasies," said the 54-year-old, who has been in a relationship for two years.