Invasion of the Bee Girls (1973)

Star Trek II: The Wrath of Khan fans take note as that film's writer/director Nicholas Meyer got his start writing the screenplay for the cheeky sexploitation flick Invasion of the Bee Girls (1973)! Special Agent Neil Agar (William Smith) is sent to investigate the mysterious deaths of several government scientific researchers working in a small California town. It appears that all of these men have died from congenital heart failure brought on by rough, ecstatic sex! Agar soon uncovers a plot by the titular cult of women who are, quite literally, fucking all of these dudes to death! What a movie! It's made even better by the bare buns of Christopher Geoffries, a motorcyclist who meets his end at the hands of our femmes fatale!