There is a very important biological reason why Mary was identified as a Virgin before the conceiving in her womb. So long as confusion can be spread like peanut butter, the notion that God used a sex cell (gamete) from Mary to make Jesus can be sustained in catholic myth mongering. Actual human conceptiuon usually takes place in the fallopian tube and rarely in the uterus since the geography does not lend itself to the male and female gametes actually find one another. The fallopian tube is a restricted passage ...
Further, the Bible says that, [Matt1:20 After he had thought about it, an angel of the Lord appeared to him in a dream. “Joseph, son of David,” he said, “don’t be afraid to take Mary as your wife, because what has been conceived in her is from the Holy Spirit. 21 She will give birth to a son, and you are to name him Jesus, because he is the one who will save his people from their sins.”] what is conceived in Mary's womb is of the Holy Spirit, not sired by the Holy Spirit, as if a God sex cell was united to a Mary sex cell, but that the being, His entire being, is of the Holy Spirit.
But wait, there's more!