Matthew 1:20-25 20 But as he considered these things, behold, an angel of the Lord appeared to him in a dream, saying, Joseph, son of David, do not fear to take Mary as your wife, for that which is conceived in her is from the Holy Spirit. 21 She will bear a son, and you shall call his name Jesus, for he will save his people from their sins. 22 All this took place to fulfill what the Lord had spoken by the prophet:
23 Behold, the virgin shall conceive and bear a son, and they shall call his name Immanuel
(which means, God with us). 24 When Joseph woke from sleep, he did as the angel of the Lord commanded him: he took his wife, 25 but knew her not until she had given birth to a son. And he called his name Jesus.
Doesn't get more explicit than that. Joseph had sex with Mary AFTER Jesus' birth, just like any normal married couple.
Matthew 12:46-50 46 While he was still speaking to the people, behold, his mother and his brothers stood outside, asking to speak to him. 48 But he replied to the man who told him, Who is my mother, and who are my brothers? 49 And stretching out his hand toward his disciples, he said, Here are my mother and my brothers! 50 For whoever does the will of my Father in heaven is my brother and sister and mother.
Matthew 13:55-58 55 Is not this the carpenter's son? Is not his mother called Mary? And are not his brothers James and Joseph and Simon and Judas? 56 And are not all his sisters with us? Where then did this man get all these things? 57 And they took offense at him. But Jesus said to them, A prophet is not without honor except in his hometown and in his own household. 58 And he did not do many mighty works there, because of their unbelief.
Mark 6:3 Is not this the carpenter, the son of Mary and brother of James and Joses and Judas and Simon? And are not his sisters here with us? And they took offense at him.
Galatians 1:19 But I saw none of the other apostles except James the Lord's brother.
I agree with you. There is plenty of reason to believe Mary had other children the normal way, and only contortionistic speculation that she didn’t.
There is nothing wrong with Mary and Joseph procreating as is normal.
Because there aren't any verses like that.
The whole "heos hou" ("until") argument has been addressed here
There's a reason why Luther explicitly endorsed the Perpetual Virginity, and why Calvin was violently offended when someone claimed he believed that Mary had other children. Luther and Calvin knew the Bible, too, and they knew that the argument against the Perpetual Virginity wasn't anywhere as easy to make as you pretend.
Boy ain't that the truth