Autoscopophilia

Autoscopophilia is when a person derives sexual pleasure from observing themselves perform sexual activities or being naked. So a person could be said to be an autoscopophiliac if they get sexually aroused from watching themselves undress or be naked (either as its occurring or in images). Another example of autoscopophilia would be an individual who derives sexual pleasure from watching themselves have sex, either while it's occurring or at a later time on video.