The heroine of this book, Lindsay, is 18 years old. Her mother is on a honeymoon cruise with her brand new husband, a very rich businessman, and Lindsay has been invited along. Her extremely generous stepfather has provided her with an unlimited open account onboard the cruise ship, with which to buy anything her heart desires, and her own highly expensive, fancy, private cabin in which to get up to any activity she chooses to engage in.
Having been a scholarly, introverted type who gets tongue tied when attempting to carry on a conversation with attractive young men, prior to this moment, Lindsay has done very little dating and is very concerned about the fact that she is still a virgin. Her main goals on this cruise are to drink a lot of expensive booze, flirt with as many good-looking young men as possible, and ultimately cull out one lucky individual from the herd of "cute" males she assumes she will encounter during the cruise for the purpose of a one-night stand on the last night of the cruise to end the life-blighting curse of her virginity. Furthermore, because she believes herself to be a young woman of foresight and careful planning, while she is quite hopeful that she will experience this hookup as a marvelously romantic moment which she'll remember with great fondness for the rest of her life, she is prepared for the alternative. In the presumably unlikely event that her projected deflowering might turn out to be an embarrassing and painful experience, she firmly believes that she will avoid any subsequent awkwardness if her one-night stand is someone she will never afterwards encounter again.
This rather sordid, so-called romance plot is normally found in "erotic romance" novels, whose focus is almost entirely on highly explicit sex scenes with relatively little attention given to actual romance and relationship building. Thus, it is rather surprising to find such a setup in a novel marketed as a young adult romance. Granted, true to the YA genre, none of the explicit sex such a plot implicitly promises is included in this book. Instead, all that is offered of this type of plot is, instead of sexual action, lots of passive and redundant introspection about the heroine's rather self-destructive belief that being a virgin is akin to suffering from a dreaded social disease.
In my own personal opinion, the sleaziness of that sort of plot, combined with the heroine's endless drinking and frequent drunkenness (activities which are illegal in the USA but apparently legal on the high seas) eliminates this book as being a young adult novel and moves it more in the direction of a new adult novel. I would also classify this book as more chick-lit than romance, because the heroine spends most of the book engaged in activities that do little to advance the romance plot.