Charlie is in his early 30s. He is a successful business owner but was arrested after exposing his genitals in an elevator while out of town for a convention. After Charlie met with a court-appointed psychologist, it was discovered that he has

Exhibitionistic disorder

Explanation:

Exhibitionism is a mental  paraphilic disorder that gives  the urge to exposing the private parts of one's body in public which gives them  a sense of   sexual enjoyment from  such behavior.  The exhibitionist usually having an antisocial personality disorder always tend to have a  great desire  to expose themselves mostly strangers without their consent  and have no sense of shame or guilt  for their actions.

Charlie , who exposed  his genitals in an elevator while out of town for a convention was discovered that he probably has Exhibitionistic disorder

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.