Being fond of sex, say, could make nuts ache (8)

I believe the answer is:

unchaste

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'being fond of sex say' is the definition.
I can't judge whether this definition defines the answer.

'make nuts ache' is the wordplay.
'make' indicates anagramming the letters.
'nuts'+'ache'='nutsache'
'nutsache' with letters rearranged gives 'UNCHASTE'.

'could' acts as a link.

Can you help me to learn more?

(Other definitions for unchaste that I've seen before include "Lascivious" , "Not decent and virtuous" , "Engaging in illicit affairs" , "Enjoying sex" , "libertine" .)

I've seen this clue in The Independent.

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