Eaves Housing, UK and Prostitution Research &Education, USA released a new report in December 2009 called Men Who Buy Sex.

A sample of 103 men in London, England, who used trafficked and non-trafficked women in prostitution were asked about their experiences and awareness of the sex industry. Almost all (96%) bought sex indoors. Many reported that they were aware of pimping, trafficking and other coercive control over those in massage parlour, brothel, and escort prostitution. These men were frequently aware of the vulnerability and risk factors for entry into prostitution including childhood abuse, lack of alternative job choices, coercive control and homelessness.

The men listed effective deterrents to buying sex which included time in prison, public exposure and being issued an ASBO. They described their ambivalence about buying sex and their ambivalence about the nature of their relationships with women. Some of the attitudes expressed by the interviewees in this study have been associated with violence against women in other research.
 
The report can be downloaded here.