The Mermaid - Erotic Fairy Tales Volumes 1-5, #4

Prince Brennan is sent on a ridiculous mission by his father the King, to find a cache of pirate gold. When they arrive at the island rumored to contain the gold, the crew starts to hear mysterious singing, pulling them from bed. Finally one night three women appear on a jetty of rocks, their sirens song and naked bodies tempt the men into dangerous consequences.