One of the biggest differences among clubs is the distinction of "On-Premises" or "Off-Premises" swinger clubs. On-Premises swingers lifestyle clubs are ones that offers rooms or areas that permit couples to engage in sex either alone or with others. Off-Premises clubs are ones that allow for couples to meet and often dance or can socialize but have no areas or rooms where any sexual activity can occur. Larger establishments may include the facilities of an ordinary nightclub such as a bar and a dance floor. Each club sets the rules for activities which take place at club organised events. Some clubs organise events which cater to heterosexual couples or individuals, others to gay men or (rarely) lesbians, and others have no orientation policy. Some cater to non-conventional activities, such as gang bangs, BDSM or fetish.