Confessional Lutherans believe in the Real Presence, but not transubstantiation.
Mary is regarded as the Virgin Mother of Jesus, and a typical obedient Jewish wife. So no to perpetual virginity, and by her own admission not sinless.
As I said, Luther was Catholic, so he might have many personal opinions that didn't withstand Scriptural scrutiny so as to be made doctrinal in the Lutheran Confessions. His views on Mary were some of them. Lutherans honor Mary as the Mother of Jesus, but worship and adore her Creator, not His creation.
Therefore, Lutherans today, rejected some of Luther’s beliefs since they were too Catholic. I don’t have time to link to Luther’s remarks regarding the Eucharist and Mary, but if possible will do so in the future.
:)May the Lord be with you this day and always.