I don't think it's a metaphor for anything apart from the obvious; chocolate being a metaphor for love. It's just a clever use of language, since chocolate melting and flowing around you is a very sexual thought.
Basically the whole song is about how she's consumed by love ('If love were liquid it would drown me'), and it's led to her make many mistakes.
The metaphor of chocolate replacing love can be taken further. It can be very sickly if you have too much at once (and she was sick of love because she had too many guys let her down), but now it 'tastes so good', because she's find the right guy.
I don't think it's a metaphor for anything apart from the obvious; chocolate being a metaphor for love. It's just a clever use of language, since chocolate melting and flowing around you is a very sexual thought.
Basically the whole song is about how she's consumed by love ('If love were liquid it would drown me'), and it's led to her make many mistakes.
The metaphor of chocolate replacing love can be taken further. It can be very sickly if you have too much at once (and she was sick of love because she had too many guys let her down), but now it 'tastes so good', because she's find the right guy.