BROOKLYN, N.Y.—On a crowded dance floor, a group of 50 women are swaying, stomping, lunging, and gyrating to singer Jason Derulo's "Talk Dirty," Pitbull's "Don't Stop The Party," and other popular numbers blasting over loudspeakers.

It could be any trendy New York club, except here the dirty words and sexually explicit lyrics are missing from the raps, and no men are allowed.

Ever.

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