Sing a Song of Sex (日本春歌考, Nihon shunka-kō, literally: A Treatise on Japanese Bawdy Songs) is a 1967 Japanese New Wave musical film directed by Nagisa Ōshima.

[2][3] The story follows four high school seniors on their erotic daydreams and peripatetic outings across Tokyo after having taken their university entrance exams.

It was screened at Harvard in 2008 as part of their "Nagisa Oshima and the Struggle for a Radical Cinema" program.

Four high school students have travelled to Tokyo on a snowy day to take their university entrance exams.

They are Nakamura (Ichiro Araki), Ueda (Kōji Iwabuchi), Hiroi (Kazuyoshi Kushida) and Maruyama (Hiroshi Sato).

The film's Japanese title (Hepburn: Nihon shunka-kō) is more accurately translated as A Treatise on Japanese Bawdy Songs; however, the film has come to be mostly known as Sing a Song of Sex, due to its DVD release name.

[10] It is a dreamlike portrayal of the violence of frustrated male sexuality, with a background of protests against the war in Vietnam and against the state.

[8] The central female character of the film is Sachiko Kaneda, who is an ethnic Korean.

The song's voice is that of a Korean prostitute attempting to lure Japanese customers for money, but the audience of young people cannot understand or empathize with her song; soon after that a number of the young men who had been previously playing music forcibly take her away and it's suggested that they try to rape her.

[12] In the film’s final scene, Ōtake’s lover gives the four boys an impromptu lesson on the origins of the Japanese race.

In it she argues that the Japanese imperial family descended wholly from Korean conquerors.

Public, spontaneous, social singing is a custom of modern Japanese life.

[2] The main song of the film is Yosakoi Bushi, which the four protagonists often sing and improvise upon.

When you do it with a noble person, you have to do it in haori and hakama (traditional Japanese male formal clothing).