I think a valid question to ask Catholics about this point is, "If Mary can be shown to have had additional children with her husband, Joseph, after Jesus was born, would it effect their views about her and how would it?". In other words, how much a part of Mariology IS her perpetual virginity? If she can be shown to have had a normal, divinely-approved sexual relationship with her husband that produced other children, WHY would she be thought of or honored differently? How is the view of her changed?
Shown HOW? Delivery-room home videos?
WHY would she be thought of or honored differently? How is the view of her changed?