Thar She Blows! (1968)

Captain Bob Frigate is a schooner owner who has a problem with sex: He hates it. But he has a good reason; ten years earlier, while in the company of a prostitute after being discharged from the US Navy, three waterfront thugs attempted to rob him but ended up castrating him with a dock hook instead. Deeply unhinged and living aboard his "100 Foot Twin-Screw Cruiser," Captain Frigate is not happy to learn that his younger sister, Sally, is having an affair with his with his first mate, Ron. Things get even more complicated when his boat is then chartered by a sleazy Hollywood movie producer named Keynon Alder, who brings along his director/pimp Phil Latio, and three up-and-coming Hollywood starlets, Teddy, Wendy and Sheri. As the guests get it on with one another, Sally with Ron, then Ron with Teddy, Phil with Wendy, Keynon with Sheri, etc... Captain Frigate becomes more unhinged when Teddy has a similar resemblance to the prostitute that entrapped him years earlier, leading to another bloody dock hook.