If it wasn't for the very frequent nudity from its two lovely actresses, Ruggero Deodato's Waves of Lust would be a very boring film indeed. Even with the regular nakedness, it's still moderately dull.
The main problem is the notable lack of a decent plot: a young couple, Irem and Barbara (Al Cliver and Silvia Dionisio) befriend a sadistic businessman Georgio (John Steiner) and his submissive wife Silvia (Elizabeth Turner) and are invited to spend the weekend with them on their motor yacht. In between visiting deserted islands and scuba-diving, the foursome indulge in partner swapping, but Georgio's heavy drinking and sadistic streak ultimately results in violence and death. The bulk of the film involves the various characters hooking up with each other for scenes of softcore titillation, which is fine for a while, but eventually leads to tedium, and one yearns for a clever plot twist to make things more interesting.
Unfortunately, the writers of this mess seem unable to come up with anything of interest outside of the nipple-sucking, thigh stroking and breast fondling. The final act, which doesn't come soon enough, sees Irem and Barbara sailing away on Georgio's boat, Silvia having fallen overboard and presumably drowned, with a drunken Georgio ditched in the ocean wearing scuba gear and a load of weights around his neck. What the film doesn't show is the young couple being arrested for double murder the moment they try to moor the stolen boat in a harbour.
4.5/10 for the bums, boobs and bush, rounded up to 5 for the very sexy Dionisio, who reminded me a bit of my favourite Hammer actress, Linda Hayden.
N.B. Animal lovers beware: Deodato gets some practice in for his infamous Cannibal Holocaust with the killing of a moray eel, the poor creature harpooned and then stabbed in the head with a large knife.