Chemsex, the term to applied to for staying up for days having sex with multiple partners taking drugs, is causing great concern to the British government. Clinics are being set up to deal exclusively with the negative results of the chemsex lifestyle, a subculture predominantly populated by gay men.

The drugs most commonly associated with chemsex sessions are GHB (liquid ecstasy), mephedrone and crystal meth, the heavy usage of which is concerning medical professionals who are seeing increasing cases of addiction, psychological withdrawal and mental health issues attributed to "losing days and not sleeping or eating for 72 hours".

The LGBT drugs charity Antidote reports that 64 per cent of visitors in 2013-14 reported using "chemsex drugs", with three quarters reporting injecting drugs, causing alarm over HIV and Hepatitis C transmission. The report also says, "An increased number of sexual partners may also increase the risk of acquiring other sexually transmitted infections. Data from service users suggest an average of five sexual partners per session and that unprotected sex is the norm."

Head here to read our full-length investigation into chemsex, chillouts and the way that meth is changing the way that gay men have sex.