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Sex clubs, also known as swinger clubs or lifestyle clubs, are formal or informal groups that organize sex-related activities, or establishments where patrons can engage in sex acts with other patrons.

A sex club or swinger club differs from a brothel in that while sex club patrons pay an entrance fee and may pay an annual membership fee, they only have an opportunity to have sex with other patrons, not with sex workers. A similar type of club is a masturbation club in which members, either single-gender or mixed, masturbate together in public or private rooms. Sexual intercourse is generally prohibited in such clubs. There is also a very large and growing group of private sex clubs that, to avoid legal problems, do not operate in a specified location. These organizations focus on private parties in homes or rented facilities and make use of the Internet to build their membership. There is usually a small door fee and most are invitation-only.