Jesus was born pure and that could only have happened with Mary being pure.
You can’t extract the Virgin Birth without extracting the Life of Christ — they are the same and inextricably linked.
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I agree completely. However that doesn’t answer the question as to why she MUST have remained a Virgin AFTER the birth of Christ.
>>However that doesn’t answer the question as to why she MUST have remained a Virgin AFTER the birth of Christ.<<
Again, purity. The Virgin Birth is one of last times we see God’s hand directly. It is critical He be seen in the event, which included her staying a virgin through and, more importantly, after.
And that about exhausts what I can assemble from my years as a Catholic way back when...