Swingers who hold sex parties in a suburban Dallas home say in a lawsuit that their lifestyle is being unconstitutionally targeted by a city ordinance.

Jim Trulock, whose home transforms into "The Cherry Pit" on weekends, sued the City of Duncanville on Wednesday. City officials last month passed an ordinance banning sex clubs, calling it a response to neighbor complaints about the traffic and noise The Cherry Pit attracts each weekend.

Upward of 100 people attend the parties, which feature themes like "Naked Twister" nights.

The lawsuit accuses the city of having no "constitutionally acceptable" grounds to enact the ordinance.

City spokeswoman Tonya Lewis had no immediate comment.