This as you can see refers to the virginity of Mary as it relates to Christ’s birth, not going forward. Matt 1:25.
I should have included raygunfan in my response to you.
raygunfan mentioned that protestants are very quiet on Luther’s words on Mary as ever virgin.
You stated that it isn’t Lutheran doctrine.
I was agreeing with both of your statements.
It is true that Luther did mention several times in his writings that Mary remained a virgin after Christ was born, that Mary bore no other children, and that Joseph never did know Mary carnally.
See
http://www.catholicbridge.com/catholic/martin_luther_on_mary.php
It is also true that protestants, even Lutherans, are very quiet on Luther’s words. Lutherans include it as doctrine in neither the Augsburg Confession nor the Large Confession. It is only mentioned incidentally in the Lutheran Church Missouri Synod’s declaration on the Person of Christ that Mary nevertheless remained a virgin.
See Section VIII (24) at
file:///C:/Users/Rich/Downloads/Solid%20Declaration%20(2).pdf
LCMS does not doctrinally teach Mary was 'ever virgin'. Mary's virginity was only of consequence as a virgin conceiving and bearing the Son of God IAW with the prophetic words of scripture. Scripture is silent on Mary's sex life after Christ's birth, but as a faithful woman the assumption can be made she was also a faithful wife to her husband Joseph. In any case, Christ is the center of scripture and the only source of salvation as the only mediator between God and man, the only One with the Father and the Holy Spirit worthy to receive worship and praise. Any other inference is in error.