Captain Brandon is demonstrating to his crew on how to extract pearls from clam boys. This particular boy, Caleb, has been tamed by the captain for some time and is easily handled. He'll find the captain himself for his periodic milking. Pearls get made in their groins and they become built up which means regular milking is needed. Clam boys are rare so so far only Brandon knows the whereabouts to obtain these amazing treasures.
The blue pearl bracelet that the hunky seaman wears is made from pearls he's squeezed from Caleb