The Slumber Party Massacre (1982)
The title leaves nothing to the imagination. This is sexploitation disguised as girl-power. Or was that vice versa? The film was financed by Roger Corman and written by LGBT feminist Rita Mae Brown, so the power-struggle behind the scenes is almost palpable. And the level of irony is certainly open for interpretation. The director was Amy Holden Jones, who later found success as penner of the family movie Beethoven (!) and the somewhat more lewd Indecent Proposal.