A behavior characterized by getting sexual gratification or arousal from exposing ones genitals to an unsuspecting observer.

one who receives sexual gratification by exposing one's sexual organs.

Syndrome characterized by a compulsion to expose one's genitals to a stranger. The typical case is a young man exposing his erect penis to unsuspecting females.

extravagant and conspicuous behavior intended to attract attention to yourself

Exhibitionism (also known as Lady Godiva syndrome and Apodysophilia) http://www.sex-lexis.com/Sex-Dictionary/apodysophilia is the psychological need and pattern of behavior to exhibit naked parts of the body to other people. In exhibitionism the individual shows a tendency to an extravagant, usually at least partially sexually inspired behavior to captivate the attention of others in a display of a body part, or parts, that would otherwise be left covered under clothing in nearly all other cultural circumstances.

a scene which takes place in a publicly visible area (anything from a public park to a public bar).