from the tv show,
Reaper:
Sam: Two psychos in love?
Devil: Love? There's no such thing.
I'm talking about real passion - Lust.
Sam: You don't think love is real?
Devil: The french invented love,
so they could put a civilised face to a primal urge.
Dress it up with candy and hearts and cupid.
In the end, it all comes down to endorphins and genitalia.