This book is about a trait describing variations in the universal need for novel and intense stimulation and its expressions in various risky kinds of behaviour (including driving habits, health, gambling, financial risk, alcohol and drug use and abuse, sexual behaviour, and sports). Sensation seeking is also important in preferences for various vocations, media forms and content, food, humour and social attitudes. Compatibility in the trait influences premarital and marital relationship satisfaction. Its modes of assessment, behavioural expressions, and genetic and psychobiological bases are described by one of the leading researchers in this field. This book presents the only available study of this fascinating topic and it will be sure to interest researchers and their students active in personality research.