Answer: Exhibitionistic disorder
Step-by-step 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