Wrong to "infer"? Hogwash.
Trust the plain facts.
Perhaps it is wrong for you to not consider the context, that a timeframe for Joseph to know his wife was limited Before Jesus' birth, and no limited presented for Joseph to know his wife...After Jesus was born.
Heos (till) does define a "limit" and the "release" of the "limit" per the context of the timeframe.
Matt 1:
[25] And knew her not till she had brought forth her firstborn son: and he called his name JESUS.
Joesph did not know (have sex) with His wife (Mary) for a limited timeframe.
Joseph knew his wife Mary...when the timeframe passed...PLAINLY revealed, was after she birthed Jesus.
Mt 1:25 says nothing Mary having sex after Jesus was born.
Until is a time marker, denoting up to a point in time. I think Illuminator has been through all this but I will go through it again for you.
The word
until (or
till) denotes a point in time up to which some action occurred. It does not mean that the action changed, only that there was something significant about that point in time. That point in time may be significant for reason other than a change in the action. What happened after that may be explicitly stated or may be inferred from the context, or may just be left unknown. To claim it always means the action changes is not valid and leads to absurdities.
Mt 1:25 cannot be used to prove that Mary had a sexual relationship with Joseph. To infer it is to claim what has yet to be proved.
Consider this line: "Michal the daughter of Saul had no children
till the day of her death" (2 Sam. 6:23 -).
Are we to assume therefore she had children
after her death?
“There was also a prophetess, Anna, the daughter of Phanuel, of the tribe of Asher. She was advanced in years, having lived seven years with her husband after her marriage, and then as a widow
until she was eighty-four.” Lk 2:36-37).
Does that imply she got married at the age of 84?
Jesus said to the Apostles “And remember, I am with you always, to (
until) the end of the age.” (Mt 28:20).
Does that mean he won’t be with us after the end of the age?
"but to [until] this day no one knows the place of his [Moses] burial" (Deut 34:6)
Do we know the place of Moses burial?
"For he [Christ] must reign
until he has put all his enemies under his feet." (1Cor 15:25)
Will Christ stop reigning after he has put all his enemies under his feet?
"
Until I arrive, attend to the reading, exhortation, and teaching."(1Tim 4:13)
After Paul arrives will Timothy stop reading, exhortation and teaching?
We know that all creation is groaning in labour pains even
until now; (Rom 8:22)
Has creation stopped groaning?
"except that you must hold fast to what you have until I come." (Rev 2:25)
Do we stop holding fast after Christ comes?
"To the victor, who keeps to my ways
until the end, I will give authority over the nations."(Rev 2:26)
Do the victors stop keeping Christ’s ways at the end?
"keep the commandment without stain or reproach
until the appearance of our Lord Jesus Christ" (1Tim 6:14)
Could Timothy stop keeping the commandments when Jesus appeared?
From the Concise OXford English Dictionary
until
n preposition & conjunction up to (the point in time or the event mentioned).
From the
Collins Concise Dictionary says a little more:
until
1. up to (a time}
2. (used with a negative) before (a time of event)
Until is used to mark a period of time and says nothing about what happens outside that period of time.
Something happens, or does not happen from time point "A"
until time point "B"
What happens after time point "B" we either:
1. simply do not know
2. infer from something else in the text
3. assume from the general context