Chemsex is defined by the use of three specific drugs in a sexual context (methamphetamine, mephedrone, GHB/GBL) and involves using one or more of these drugs, in any combination, to enhance sex, with or without other drugs

An episode of Chemsex can sometimes last several days and someone engaging in chemsex may find little need for sleep or food.  The heightened sexual focus can also lead to more extreme sex for longer periods, often with more partners and with less fear of STIs

Sharing injections is also common during Chemsex episodes due to a reduced sense of risk.