Sex on Premises Venue (SOPV) is the term used, primarily in British and Australian medical literature, for the various commercial venues, as opposed to public spaces and parks, which provide for men who have sex with men (MSM) to meet and have sexual relations with each other on site. A similar term, "on-premises club", is used by heterosexual swingers to describe a sex club in which non-commercial sexual activity takes place between clients or members.