Striptease involves a slow, sensuous undressing. The stripper may prolong the undressing by making sure that the sensual build-up has been properly done using techniques such as the wearing of actual clothes or putting clothes or hands in front of just undressed body parts such as the breasts or genitalia in a sensual and playful manner. The emphasis is on the act of undressing along with sexually suggestive movement, rather than the state of being undressed. In the past, the performance often finished as soon as the undressing was finished, though today's strippers usually continue dancing in the nude. The costume the stripper wears before disrobing is part of the act. In some cases, audience interaction can form part of the act, with the audience urging the stripper to remove more clothing, or the stripper approaching the audience to interact with them.