exhibitionist

Concise Oxford English Dictionary © 2008 Oxford University Press:
exhibitionism/eksɪˈbɪʃənɪzəm/

▶noun

• 1 extravagant behaviour that is intended to attract attention to oneself.

• 2 Psychiatry a mental condition characterized by the compulsion to display one's genitals in public.

– derivatives
exhibitionist noun,
exhibitionistic adjective,
exhibitionistically adverb.