Approximately half of the U.S. population reports having a preference that goes beyond 'normal sex.' Studies show varying results, but between 20-40% consider themselves 'kinky.' A study in Canada shows that about half have fantasized about power play, i.e., having a submissive or dominant role in bed. Fantasies do not automatically mean wanting to act them out, but these numbers suggest that kink is common.
Kink can include, for example, role play. Kink is an interest in a particular sexual act, while a fetish involves being turned on by specific objects or specific parts of the body, but it can also include being aroused by particular sexual acts. Kink can include, for example, dirty talking, role play, and power dynamics such as dominance vs submission.