Using hands, man goes for it to show how babies are made (8)

I believe the answer is:

sexually

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'goes for it to show how babies are made' is the definition.
I can't judge whether this defines the answer.

'using hands man' is the wordplay.
'using hands' becomes 'sexual' (I can't explain this - if you can you should believe this answer much more).
'man' becomes 'ly'.
'sexual'+'ly'='SEXUALLY'

Can you help me to learn more?

I've seen this clue in The Independent.

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