Dirty Blonde (1984)

Tough and sexy fedora-wearing private eye, Helen H. Harper, is hired by Karen Wolf to find her missing fiance. Harper's investigation leads to lots of sex but also to a few leads and a few persons of interest including the man's ex-wife Nancy Fields, and Karen's incestuously close bitchy cousins Cindy and Agatha. Meanwhile, Harper's secretary Ivy as well as Karen herself help out with questioning the missing man's male friends. Eventually, after seeing how every woman who had experienced the missing man's lovemaking skills can never be satisfied again by anyone or anything else, Harper decides to risk everything and break into the apartment of Karen's cousins. The case ends with a big bang in more ways than one.