Does anyone know of any gothic or “dark” romantic duets?

I like the seductive quality that gothic (and darkwave) music can give..can anyone point me to a song like this? (preferably one I can locate and purchase) Thanks! ^_^
Thanks for answering all! I am a HUGE fan of Nick Cave so I know of this song (and Henry Lee as well). I should have used this in my description of what i"m looking for…anyone know of any other duets like these?