Hard Vice (1994)

Gritty male cop Sam Jones is teamed with drop-dead beautiful lady cop Shannon Tweed in Hard Vice. Jones and Tweed operate out of the vice squad in "sin city" Las Vegas. Right now, the dog-and-cat team is trying to solve a series of murders. The victims are all wealthy men who frequent the various houses of prostitution in the area. Suspicion falls upon a group of expensive call girls. Naturally, this requires the gorgeous Ms. Tweed to go under covers-er, undercover. imdb