ah....really? Cause you know if you never had sex that is bad for childbearing... ehehe...
Yes, IF it could be confirmed that Mary had other children, I suspect most would arbitrate your dogma to be heresy. But while some believe that is MOST LIKELY, there is (to date) no denomination that says this is a dogmatic fact.
No, IF it could be confirmed that Mary had no other children, that's entirely irrelevant because there is no dogma that She ever did and it's irrelevant to the issue of whether she once lovingly shared intimacies - unless you will enter into the discussion the biological proof that every single act of such sharing specifically results in a born child that we can confirm. Thus - IF she had other children is relevant, if she did not is not. But, everyone seems to agree that neither position can be confirmed (although it seems to me the "yes" side has a stronger albeit not solid argument).
Here's what kind of interesting to me. People will share an OPINION - just a personal opinion, not a formal teaching, not a doctrine, not a dogma, not de fide, just a view - that Jesus had siblings by Mary. And you raise the bar very high for them, rejecting a fairly normal and natural and literal interpretation to stress "but it COULD mean something other." People generally yield that. But you come with a DOGMA on a far more personal, private level (sex) - shouting in the boldest, loudest way that it is a dogmatic fact of highest importance to the world's people and greatest certainty of truth and fact that Mary Had No Sex EVER - and yet you have far, far, far less on your 'side' for that than the "He had sibs" side has (although no one is suggesting that side can confirm dogma here). You seem to be so boldly rejecting a MUCH stronger apologetic for a far less personal and far more relevant issue - while asking all to accept your position (about what is usually a rather private matter) based on a far weaker apologetic for a matter of greatest certainty of truth and fact, a dogmatic fact of greatest importance. Those of us "outsiders" - all us who just don't KNOW how often Mary had sex yet (and aren't even sure we so desperately MUST know precisely that), we see this as very odd. They have the much stronger apologetic (although insuffient for dogma - they agree) for a MUCH lower position (just personal opinion) - and you condemn it as far, far, far too weak. You are shouting DOGMATIC FACT!!!!!! and have much, much, much weaker apologetics (mostly silence.... and some CENTURIES later who believe it but never say why or even attempt to indicate that it's true). It IS stunning to read all this. And I keep asking myself, "WHY is this SO everyone's business?" I don't even know how many times my mother has had sex (frankly, while no prude, I don't want to know!) so WHY is it so very, very, very important - as much as anything could be - how often Mary and Joseph "did it" - if at all?
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