These types of exposing are thought of as exhibitionistic.

Flashing

Flashing is the display of bare breasts by the lifting of a shirt and/or bra.

Mooning

Mooning is bareing your bottom — both in a sexual, exhibitionistic way (mainly by females) and also for shock value (usually by men). This is also known as a browneye.

Anasyrma

Anasyrma is lifting up of a skirt to show a bare vaginal area, this is often to please the exhibitionist.

Martymachlia

Martymachlia is a paraphilia involving sexual attraction to having others watch the execution of a sexual act.