Then you have to disagree with favorite Sanskrit writer Srikanthan who Authored Bbagavat Geeta ! He doesnot see any Punitham in antharangam In fact he makes 'Ambalam' of it!
Kunti letting her curiosity get the better of her. She uses a magical formula given to her by a sage to summon the sun-god, Surya, who is compelled to give her a child. Fearful that a child conceived before marriage may ruin her reputation, Kunti places the child – born with a natural armor and divine earrings – in a wicker basket and leaves him afloat to a river’s whim, very much like Moses in the Bible.
But unlike Bible She was never glorified 'Virgin Kunti" or concept of immaculate conception is not there - She keeps it அந்தரங்கம் Probably she wouldnot have ventured - if she had valued her virginity - to have child - அந்தரங்கம் புனிதமானது". is only a mask to keep her honour!.
For Krishna it is war strategy Because of this Antharangam Ambalamanadu
When war is declared, Krishna tries to make Karna defect but fails. He finally motivates Kunti to tell the truth for the sake of the Pandavas. Kunti goes to Karna and tells him all. Now can we say Ambalam Punithamanatu!
http://devdutt.com/articles/mahabharata/a-boy-called-karna.html