Revert:
No its not. If you are sleeping with a Girlfriend and a Muslim, you know what you are doing is bad..if shes sleeping around then thats your own tough luck.
So if she's sleeping around, you should father the baby of another man because you're sleeping around yourself? How does that make any sense? One shouldn't even conceal adoption, so what makes you think one can conceal paternity?

shadha-
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You may shoot me with your words,
You may cut me with your eyes,
You may kill me with your hatefulness,
But still, like air, I'll rise.
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