The song "La Décadance" by Serge Gainsbourg and Jane Birkin is about a decadent and passionate love affair. The lyrics describe a sensual and provocative dance between two lovers. The title itself, "La Décadance," suggests a sense of indulgence and hedonism. The song is filled with seductive and suggestive lyrics, with the narrators encouraging each other to surrender to their desires and pleasures. They ask each other to turn towards each other, to dance with decadence and slowly move their bodies together. The lyrics also allude to physical intimacy, with mentions of hands touching and hearts being one. As the song progresses, the female narrator starts questioning the love and commitment of her partner. She wonders if he truly loves her and asks for reassurance. She confesses her love for him and claims that their souls and bodies are intertwined. Towards the end of the song, there is a reference to "troubled waters" that suddenly disturb the senses. This line may suggest a sense of chaos or turmoil in their relationship. The female narrator feels lost and hurt, asking her partner if he truly loves her. The last part of the song asks for forgiveness from God for their transgressions. It implies that their decadent love has led them astray and caused harm to their bodies and souls. The lines express a sense of guilt or remorse for their actions. Overall, "La Décadance" portrays a passionate and tumultuous love affair, exploring themes of desire, indulgence, doubt, and guilt. Serge Gainsbourg and Jane Birkin's performance adds a provocative and sensual aspect to the song, further enhancing its themes.