Undercover Sex (2003)

Tough and sex detective Lanie Malone is just too much for for the LAPD to handle. On the verge of dismissal, Lanie needs to break a major case. When a serial killer starts strangling exotic dancers she gets the opportunity she's hoped for - and a whole lot more. Lanie connects the murders to
one very exclusive sex club. Breaking all the rules, she dives into this sensual underworld undercover and discovers she revels in the brazen eroticism. Now, as the killer closes in, Lanie finds herself in the most dangerous situation of her life. If she's going to live, she'll have to be quicker, smarter, and deadlier than a vicious murderer.