Determination of kinky lovers to get endless sex (7)
I believe the answer is:
resolve
'determination' is the definition.
(I've seen this before)
'kinky lovers to get endless sex' is the wordplay.
'kinky' indicates anagramming the letters.
'to get' is an insertion indicator.
'endless' says to take the centre.
The middle of 'sex' is 'e'.
'lovers' is an anagram of 'rsolve'.
'rsolve' enclosing 'e' is 'RESOLVE'.
'of' acts as a link.
(Other definitions for resolve that I've seen before include "12 [STIFF UPPER LIP]" , "Sort out (a problem)" , "Settle (a dispute)" , "find an answer" , "break up" .)