So you're saying God had sex with Mary?
By no means! God is a spirit; sex requires a body; and God was not incarnate before Christ's birth. Nor does God require physical procreation to create life, for in Genesis we see Him creating human life from the dust and then taking Eve from Adam's rib. But the image of Israel and the Church as God's spouse appears in Scripture, and this imagery is used of God's relationship with Mary in Luke 1. In 1:35 when Gabriel tells Mary that the Holy Spirit will come upon her and the power of the Most High will "overshadow" her, the word typically translated as "overshadow", ἐπισκιάσει, has a connotation referring to a Jewish nuptial canopy-like covering under which a bride and bridegroom were betrothed (along with other connotations tying it into the cloud over the Tent of Meeting and Ark of the Covenant in Exodus 40:34-35 and anticipating the cloud at the Transfiguration in the Synoptic Gospels, all passages in which the same word is used). Early Christian commentators reading the original text in Greek noticed these connections.