Natural being uncovered, mask questionable — it's explained here with illustrations (4,5)

I believe the answer is:

kama sutra

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'explained here with illustrations' is the definition.
I know nothing about this answer so I can't judge whether this works.

'natural being uncovered mask questionable' is the wordplay.
'being uncovered' means to look at the middle letters.
'questionable' is an anagram indicator.
The middle of 'natural' is 'atura'.
'atura'+'mask'='aturamask'
'aturamask' anagrammed gives 'KAMA SUTRA'.

'it's' is the link.

Can you help me to learn more?

(Other definitions for kama sutra that I've seen before include "Sanskrit treatise on the art of love" , "Hindu exotic text" , "Hindu sex manual" , "Ancient Sanskrit text on sexual love" , "the other illustrations" .)

I've seen this clue in The Guardian.

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