Unlimited affection? (4,4)

I believe the answer is:

free love

I'm a little stuck... Click here to teach me more about this clue!

'unlimited affection?' is the definition.
'free love' can be an answer for 'affection?' (thesaurus). I am unsure of the 'unlimited' bit.

'unlimited affection?' is the wordplay.
'unlimited' becomes 'free' (I can't justify this - if you can you should believe this answer much more).
'affection?' becomes 'love' (affection is a kind of love).
'free'+'love'='FREE LOVE'

Can you help me to learn more?

(Other definitions for free love that I've seen before include "presumably ruling out bondage" , "General Congress" , "Promiscuity" .)

I've seen this clue in The Guardian and The Globe and Mail.

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