God bless !
I think the problem is, that you are speaking of marriage and sexuality when we are speaking of the Bride of God and the Mysteries of Christ's Incarnation - yes, it is important to believe in the Ever- virginity of the Theotokos because it depends on the Holiness of Christ/God who dwelt in Her and took his flesh from Her.
So the Doctrine of the Evervirginity of Theotokos is also a christological Doctrine !
+ the Theotokos was consecrated to God before She was borne -by her parents- it would be a great sin to break this vow.
+the Theotokos never thought of Marriage, we can see that in her answer to the Angel - How shell this be, since I know not man ........She is THE Virgin - not in a biological or moral sense NO- Virginity means to be free for God and to love him with the whole being.
+St. Joseph was her Betroughed and not her Husband- he was her protector ( think how hard it would have been for the Virgin without Joseph- all the troubles and the persecution of the Christ Child, the filght to Egypt, and she would have been killed without him -for being pregnant
+it wouldn't be proper to have other children beside the God Child - Christ was not a "holy man" or a great Prophet, he was/is " TRUE GOD ", before him the universe is trembling and Cherubim and Seraphim are praying without ceasing HOLY HOLY HOLY, and the Theotokos was not like an unpersonal channel where Christ passed through without uniting with her and her flesh, She was one flesh with Christ and She loved only him with her whole being, all her life was only concerned about Christ - God, how could she be interested in a normal family life with husband and children after bearing Christ-the King of Glory. Do you think God wants to share his mother('s flesh) with other Children ? NO
She is also called the THRONE OF GLORY, do you think God would allow someone else to take place on HIS HOLY THRONE
She is the Tempel of the God, the City of God, the New Zion, the New Jerusalem, the Bride of God, the Queen standing beside God, ..........
You only have to read the OT and see the Holiness of the Vessels of the Tempel and that it was not allowed to profan them- it was not allowed to touch the Arc, or the Sinai when God spoke to Moses, it was not allowed to enter the Most Holy where God's glory appeared, it was not allowed to pass through the gate in the east because God passed through, do you also read how Moses was shining after speaking with God ? How much more shone the Theotokos - she did not speak with God - she conceived him in her womb and he took flesh from her - She was one with him -oh how must she shone, do you also read about God's horrible Glory and seeing it was dangerous, Moses only saw the back of God's Glory and rejoiced to be still alive- the Theotokos did not only see the back of God's Glory, She was the Temple of his Gory, she was filled with His Glory do you see the great Difference ? And you think the Temple of HIS horrible Glory began to know man and a normal familiy life, this would be a great sin and a horrible profanation of God's Tempel?
But let's look to the Scripture:
3:2 And the Lord appeared to him in a flame of fire out of the midst of a bush: and he saw that the bush was on fire, and was not burnt. ( Symbol for the Theotokos )
3:3. And Moses said: I will go, and see this great sight, why the bush is not burnt.
3:4. And when the Lord saw that he went forward to see, he called to him out of the midst of the bush and said: Moses, Moses. And he answered: Here I am.
3:5. And he said: Come not nigh hither, put off the shoes from thy feet; for the place, whereon thou standest, is holy ground.
3:6. And he said: I am the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob. Moses hid his face: for he durst not look at God
Do you see how Holy even a Vision of God is ? And that Moses feared to look at God ?
19:11. And let them be ready against the third day; for on the third day the Lord will come down in the sight of all the people, upon Mount Sinai.
19:12. And thou shalt appoint certain limits to the people round about, and thou shalt say to them: Take heed ye go not up into the mount, and that ye touch not the borders thereof: every one that toucheth the mount, dying he shall die.
19:13. No hands shall touch him, but he shall be stoned to death, or he shall be shot through with arrows: whether it be beast, or man, he shall not live. When the trumpet shall begin to sound, then let them go up into the mount.
19:14. And Moses came down from the mount to the people, and sanctified them. And when they had washed their garments,
19:15. He said to them: Be ready against the third day, and come not near your wives.
19:16. And now the third day was come, and the morning appeared: and behold thunders began to be heard, and lightning to flash, and a very thick cloud to cover the mount, and the noise of the trumpet sounded exceeding loud; and the people that was in the camp, feared.
19:17. And when Moses had brought them forth to meet God, from the place of the camp, they stood at the bottom of the mount.
19:18. And all Mount Sinai was on a smoke: because the Lord was come down upon it in fire, and the smoke arose from it as out of a furnace: and all the mount was terrible.
19:19. And the sound of the trumpet grew by degrees louder and louder, and was drawn out to a greater length: Moses spoke, and God answered him.
19:20. And the Lord came down upon Mount Sinai, in the very top of the mount, and he called Moses unto the top thereof. And when he was gone up thither,
19:21. He said unto him: Go down, and charge the people; lest they should have a mind to pass the limits to see the Lord, and a very great multitude of them should perish.
19:22. The priests also that come to the Lord, let them be sanctified, lest he strike them.
19:23. And Moses said to the Lord: The people cannot come up to Mount Sinai: for thou didst charge, and command, saying: Set limits about the mount, and sanctify it.
19:24. And the Lord said to him: Go, get thee down; and thou shalt come up, thou and Aaron with thee: but let not the priests and the people pass the limits, nor come up to the Lord, lest he kill them.
19:25. And Moses went down to the people and told them all.
34:29. And when Moses came down from the Mount Sinai, he held the two tables of the testimony, and he knew not that his face was SHINING from the conversation of the Lord.
34:30. And Aaron and the children of Israel seeing the face of Moses horned, were afraid to come near
34:31. And being called by him, they returned, both Aaron and the rulers of the congregation. And after that he spoke to them,
34:32. And all the children of Israel came to him: and he gave them in commandment all that he had heard of the Lord on Mount Sinai.
34:33. And having done speaking, he put a veil upon his face.
34:34. But when he went in to the Lord, and spoke with him, he took it away until he came forth, and then he spoke to the children of Israel all things that had been commanded him.
34:35. And they saw that the face of Moses when he came out was SHINIG, but he covered his face again, if at any time he spoke to them.Exodus 40:34
40:32. The cloud covered the tabernacle of the testimony, and the glory of the Lord filled it.
40:33. Neither could Moses go into the tabernacle of the covenant, the cloud covering all things, and the majesty of the Lord shining, for the cloud had covered all.
People even feared to come near Moses because his face was shining from the Vision of God-how much more did the face of the Theotokos shinig after bearing God ? And you think, when it is even fearful to look at the face of the Theotokos because of her God bearing, that she had known a man and had other Children and started a normal familiy life ?
Do you see that, to think SHE had a husband and other Children is to profan the HOLINESS óf GOD/ CHRIST !
Let me tell you again- it is very important to have a right understanding of the Glory and Holiness of the Theotokos because of Christ. To deny her Holiness is to deny Christ'S/God's holiness.