It's a bad cheap psychedelic exploitation horror from Italy, that some have called a giallo, but it isn't. It's far nearer other cheap bad early 1970s horrors from Spain and the UK.
The plot revolved around a rather dysfunctional family, where the daughter gets flashbacks of being raped as a child whenever she makes love to a man (and she likes to get around!) She then enters a blood rage and kills them (generally by decapitation) and the rest of the family have to clean up the mess. This is done via an acid bath in an outhouse.
There are twists and turns a plenty throughout the film, and no-one's quite who they claim to be. The awful waxwork head decapitation scenes are hilarious, and a Nazi deathcamp flashback filled with naked girls being ushered into gas chamber showers helps ramp up the sleaze factor to 10.
The upside is that it's all very whacked-out sleazy stuff, and has some great psychedelic interiors, the downside is it just isn't a very good film. It's only really going to be of interest to connoisseurs of 60s/70s exploitation trash.