Nothing's 'eightened arousal in place of couple being face-to-face (4,4)
I believe the answer is:
love seat
'nothing's 'eightened arousal in place' is the definition.
I can't judge whether this definition defines the answer.
'couple being face-to-face' is the wordplay.
'couple' becomes 'love' (loving is a kind of coupling).
'being face-to-face' becomes 'seat' (I am not sure about this - if you are sure you should believe this answer much more).
'love'+'seat'='LOVE SEAT'
'of' is the link.
Can you help me to learn more?
(Other definitions for love seat that I've seen before include "chair" , "You should get your mate in here!" , "furniture item" , "Armchair for two" .)