Scavenger Hunt. The Society Universe

A sexy, exciting interstellar romp. The idle rich of galactic Society had little to do that was productive, so they loved to invent useless little games to keep themselves occupied--and the greatest was the Scavenger Hunt, held only once every 20 years. Visit different worlds, pick up hard-to-get items that can't simply be bought, and have a fine time. A clever way to pass empty hours. Tyla deVrie and her twin brother, Bred, follow the family tradition of entering the Scavenger Hunt.
Their parents died during the last Hunt 20 years ago, and they mean to regain the family honor. But as they hop from planet to planet aboard Bred's decadent space yacht with its all-woman crew, fate seems to be making the Scavenger Hunt far more than just a game. It will irrevocably change their lives--that is, if it doesn't end them first.