How to warm up in bed and so on, keeping quiet (5)
I believe the answer is:
spoon
'how to warm up in bed' is the definition.
(as in spooning another person)
'so on keeping quiet' is the wordplay.
'keeping' is an insertion indicator.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'so'+'on'='soon'
'soon' placed around 'p' is 'SPOON'.
'and' is the link.
(Other definitions for spoon that I've seen before include "Eating implement" , "Indulge in sentimental courtship - eating utensil" , "Canoodle" , "Kiss - server" , "may create a stir" .)