If she stayed a virgin after Jesus then she was unfaithful to her husband.
If Mary remained a virgin all of her life then Joseph was a pretty pathetic husband.
The Holy Spirit - since He overshadowed her - acted as her spouse and she was in fact very faithful to Him.
Also, Joseph was an upright and righteous man. He would not go where he didn’t belong.
We've somewhat of a quandry here.
I'm pretty sure Jesus was Mary's first born, yes?
Therefore, tho extraordinarily far fetched and kinda spooky to boot, the "virgin birth" is at most, plausible.
Now....if Mary....according to the church, remains "ever virgin"....exactly how did Jesus' brothers happen along? Or were all of them via "virgin birth" too? And if so, then the original miracle kind of "waters down", don't it. And if not...exactly where did they come from?
You know what they say!!! "Happen once...a miracle. Happen more than once...ordinary."
And if he had sexual intercourse with her he dishonored the Holy Spirit.