On the face of it, there should be nothing romantic about pirates. They take hard-earned money and goods away by force - typically accompanied by torture, murder and rape. And yet there is still something attractive about a life of adventure, freedom and lived without responsibility.
SotC is a OGL role-playing game written by Evil Hat Productions and based on their FATE system. This supplement contains additional rules to tailor SotC to the pirate genre. The SRD for SotC can be found at http://www.faterpg.com/dl/sotc-srd.html. If you don't want to use this game, the information will be useful for any tabletop campaign.
As well as the rules, this book also contains a history of piracy (both in reality and in fiction) and looks at the enduring appeal of these "wolves of the sea" and what we find attractive about characters like Long John Silver and Captain Jack Sparrow that are as magnificent as they are malevolent. This book should allow you, the GM, to create games that tap into these tropes to provide a more enjoyable experience for your players and yourself.