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 is financed by Roger Corman and written by LGBT feminist Rita Mae Brown, so the power-struggle behind the scenes is almost palpable. The level of irony is up for grabs. The director is Amy Holden Jones, who later found success as penner of the family movie Beethoven (!) and the somewhat more lewd Indecent Proposal.