Love to have sex, not about to retreat (4)

I believe the answer is:

eros

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'love' is the definition.
(Greek god of love)

'sex not about to retreat' is the wordplay.
'sex not' becomes 'so' (I can't justify this - if you can you should believe this answer much more).
'about' becomes 're' (regarding).
'to retreat' is a reversal indicator.
'so'+'re'='sore'
'sore' backwards is 'EROS'.

'to have' is the link.

Can you help me to learn more?

(Other definitions for eros that I've seen before include "Greek love-god" , "I'm in a circus in London" , "Statue of love-god in Piccadilly Circus in London" , "Winged archer" , "Arrow-shooting god" .)

I've seen this clue in The Guardian.

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