Devil;s Den (2006)

Quinn Taylor and his friend Nick are on their way back from Mexico with a load of Spanish Fly to sell in the States. They stop at a gentlemens club called The Devils Den and decide to test out their product on the unsuspecting women there. Only, these women arent really human, and the two men find themselves in a very fatal position. Also tossed in are a female-assassin on the hunt for Quinn, a monster hunter!