The Great Sex Secret developed on a parallel track. Marshall was struck by some significant gaps in sex literature and popular media and started work on a letter that he planned to give to his own children on their eighteenth birthdays.
To his surprise, this proved to be one of the most challenging projects he'd ever undertaken. Eight years of reading, research, and feedback slowly turned a twelve-page letter into something much bigger, and Marshall decided to share it with a wider audience.
A generous impulse gave rise to this book. Marshall hopes that its ideas will be helpful to many lovers, allowing them to get to the heart of the matter a little bit sooner. Life is short, the geography of love is a challenge, and sexual happiness really matters.