Chris Underwood’s review published on Letterboxd:
With Franco dead the Spanish could let rip and this one certainly goes at a pace. There are many sex and Satanism films that barely get round to either sex or Satanism, this one revels in it throughout. Just when it gets a bit silly towards the end, it gets very silly and builds to a great finale. In fact much of the film is really good, as well as almost constant bare flesh from the ladies and the gents there is blood and gore AND a really creepy atmosphere aided by the strange antics of the main protagonists. Whenever we see them in the deserted kitchen they seem bent over some dog bowl, and when they are in bed together they growl and pair like two animals. Granted an ‘S’ for sex certificate upon it’s Spanish release and it certainly deserves it, though it also deserves a ‘V’ for violence and ‘G’ for gore. Excellent stuff - and not over long! Re-watched 4/4/17 and feel I was a little generous with my previous score but hey, its good fun even if there is not much 'black magic' and the visiting couple do seem a bit dim.