Timegate: Tales of the Saddle Tramps (1999)

While visiting an historic western town, two beautiful women stumble upon a device that transports them over a century back in time to the Old West. When the girls are mistaken for brothel babes, they get a hankerin' for some real cowboy action! But their erotic recreation with the local cowpokes soon ruffles a few feathers in town- and when the deputy winds up dead, the posse's hot on their tails for some answers! They must go back to their own time, before they're punished for the crime.