http://menshealth.indiana.edu/?dlist

"Welcome to the study website for the Men's National Sex Study. This study is being conducted by researchers from the Center for Sexual Health Promotion at Indiana University, in collaboration with DList, Manhunt, and Manhunt Cares.

This study seeks to gather comprehensive information about the sex lives of men, with a particular emphasis on understanding how men feel about various sexual behaviors and activities. The Center for Sexual Health Promotion at Indiana University is one of the nation’s leading research groups that focuses on how sexually active adults make decisions that influence their sexual health.

This survey is completely anonymous. "