The results of a survey of 1,341 European clubgoers, which were recently published in the journal BMC Public Health, indicate that a third of 16 to 35-year-old males and a quarter of females intentionally drink alcohol to increase their chances of sex. Drugs like marijuana, cocaine, and ecstasy were chosen to prolong or improve sex. It's no accident, the research team concluded, that sexual activity often accompanies substance abuse.