How does a savvy businesswoman make a buck in a town overrun by lonely, oil-hunting men? She opens a steamy coffee shop, of course. Boomtown Babes Espresso has opened in once-sleepy Williston, North Dakota, which has been transformed by fracking. Williston now claims one of the most concentrated male populations in the U.S.—the male-to-female ratio could be as high as 50:1. Roughnecks craving jugs of joe are are no joke for local women, who don’t feel safe without mates and mace.