淫いん声せい

noun

sexual moans; screams during sex

Refers specifically to vocalizations made during sexual activity. Often used in adult or erotic contexts.

• 隣となりの部屋へやから淫いん声せいが聞きこえてきた。

  I could hear sexual moans coming from the next room.

noun

bawdy song; lewd song

Describes songs with vulgar or sexually explicit lyrics. A somewhat literary or formal term; in casual speech, エロい歌 or 下品な歌 is more common.

• 彼かれは酒さか場ばで淫いん声せいを歌うたって場ばを盛もり上あげた。

  He livened up the bar by singing a bawdy song.