Komm in mein Herzenshaus,
Herr Jesu, mein Verlangen!
Treib Welt und Satan aus
Und laß dein Bild in mir erneuert prangen!
Weg, schnöder Sündengraus!
(Come into my heart's house,
Lord Jesus, my desire!
Drive the world and Satan out
and let your image, shine forth renewed in me!
Away, contemptible horror of sin!)
From Bach's Cantata #80, Ein Feste Burg, You can hear it here. About 300 years old; as classical music arias go, it's as close to a romantic-sounding love song as it gets.
Well, to be fair, that song isn’t easily confused with a hormonal teenager lusting for her boyfriend.