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.
LCMS does not doctrinally teach Mary was ‘ever virgin’.
That’s my point, xone. Lutherans are very quiet on this belief expressed by Luther. It’s not mentioned in the Augsburg Confession or the Large Confession. The closest I could find was the mention in the Solid Declaration on the Person of Christ that Mary “nevertheless remained a virgin.” And from the context it was likely that this statement was only in reference to the birth of Jesus.