Party and play (often abbreviated PNP or PnP, especially in online jargon), also known as a chem session or chemical session or simply as partying, is a phenomenon and subculture of illegal drug users who play together sexually, either one-on-one or in groups. The term is used by and associated with gay men [1] and men who have sex with men (MSM). The drug of choice is typically methamphetamine, known as crystal or tina in the gay community. Other "party drugs" such as ecstasy are less associated with this term. It has been called both an "epidemic" and "plague" in the gay community.[2]