A billet-doux is a love letter.
Garçon doux in French means "sweet boy" in English. This is never used in French.
'un billet doux'
Billet-doux - 2000 is rated/received certificates of: Belgium:KT
The cast of Billet-doux - 2000 includes: An Miller Lucas Van den Eynde
Love letter
billet-doux
Douce or doux in the singular and douces or doux in plural are French equivalents of the English word "sweet." Context makes clear whether feminine (cases 1, 3) or masculine (examples 2, 4) genders suit. The respective pronunciations will be "doos" in the feminine and "doo" in the masculine in French.
bil-ay-DOO
yes
bil-ay-DOO
The cast of Max et le billet doux - 1913 includes: Georges Gorby Max Linder as Max
fond memories are translated 'de doux souvenirs' in French.