Providing one of the first comprehensive, cross-cultural examinations of the dynamic market for sexual services, this book presents an evidence-based look at the multiple factors related to purchasing patterns and demand among clients who have used the internet. The data is drawn from two large surveys of sex workers' clients in the US and UK. The book presents descriptive baseline data on client engagement with online platforms, demographics and patterns of frequency in different markets, information on smaller niche markets and client reactions to exploitation, safety and changes in the law. The book makes clear that a variety of situational as well as individual factors affect the willingness and ability to purchase sexual services. The view that emerges shatters the stereotypes and generalistions on which much policy is based and demonstrates the complexities surrounding who pays for sex and the contours of sexual consumption in consumer culture.