Horror On Snape Island - 1972 - 5/10
AKA - Tower Of Evil

Two twentyish couples boat to remote island and get frisky.
What? Their flat was being fumigated?
Too late, they realize the isolated isle has another inhabitant.
Dismemberment and carnage.
But wait!! That’s just the intro!
Next, four anthropologists decide they need to explore. Likewise couples, only estranged and canoodling.
They know someone murdered previous visitors.
Rather than carry weapons, they carry supplies and wear 70’s fashions suitable for clubbing.
Hard to be sympathetic for foolish professors in this snoozer.