Donald Winnicott distinguished between 'quiet love' (parasympathetic state) and 'excited love' (higher arousal state), both of which are important and need integration.

“Donald wincott who was a pediatrician who was one of the great psychoanalysts of the 20th century and he made the distinction between quiet love which would again be the downregulation of noradrenaline and excited which is into a parasympathetic state so you're going from a hyp sympathetic State into a parasympathetic State quiet love and then excited love which would be also passionate love which is the higher arousal State out of it so to speak and they are both important and ultimately they both need to be integrated”