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1.
This phrase is an idiom.

If you say you know someone but not in the biblical sense, you mean you have not had sex with them

Usage notes: In the Bible, 'to know' someone meant to have sex with them.
'Did you know her then?' 'Yes, but not in the biblical sense.'
David: 'Did you know her then?'
Joseph: 'Yes, but not in the biblical sense.'
by lucasizle January 10, 2012