SANFORD, Maine — The town of Sanford say the owners of a local business have been holding monthly swingers parties at a banquet hall and says they must stop.

Town officials say Jim and Susan Colley of Springvale have been using the former Knights of Columbus hall to hold the parties for a few months. The parties cost $40 for couples and single men to get in, while single women get in free. The town says the Colleys, who own a catering business that occupies part of the building, do not have a license to operate an adult business.

The code enforcement officer sent the Colleys a letter last week after an undercover officer attended one of their parties. The letter says approximately 40 people attended the most recent party and listed a litany of complaints, including, “Patrons engaged in sex acts in the immediate proximity of food that was prepared and/or served to patrons,” and that the Colleys “knowingly received and admitted patrons to the Premises for purposes of engaging in and/or exhibiting or observing for entertainment purposes, nude entertainment, and live sex acts.”

The letter says the offenses constitute tumultuous conduct, nuisances, prostitution and public indecency, and obscenity.

Despite the involvement of police, the letter only lists code violations. A spokesman for the Sanford Police Department told the Bangor Daily News that “there was no criminal activity taking place in the facility.”