As you enter your adulthood, your sexual desires start to come up. Your behavior starts to change. And there is nothing wrong in having those desires, as it is natural human tendency. Every individual has some different sexual fantasies. According to the The study, which was conducted in Quebec, Canada, asked more than 1,500 men and women what they fantasized about in the sack. Adult participants were typically between the ages of 20 and 40, and though the sample was by no means diverse, their responses are a window into a topic that has been largely unexplored by researchers. After all, what constitutes a normal fantasy?