What is "yakyuken"

is now widely known as a Japanese strip game variation of rock-paper-scissors wherein the loser of each round removes an article of clothing, similar to strip poker. Yakyuken gets its name from a Shikoku chant associated with the non-erotic version of the game which is still a local performance art nowaday. It became a part of culture in Japan due to mass media influence, and in other Asian countries after the influence of TV variety shows and Soft On Demand. Numerous hentai games have been made featuring the Yakyuken gameplay, and several American studios, such as Lost Bets Productions, focus on the filming and marketing of Yakyuken and other related strip games.