Dave, the Greek is the idiom for sex between a man and a woman. What else could that possibly mean?
There is no reason at all to look for another meaning when that one is perfectly clear. It follows every rule of Biblical interpretation.
Are you still here a week later not undestanding what the objection is?
Apparently. It's like a wise person once said "you seem to have a difficult time recognizing what aspects of an argument are in agreement and which are in dispute."
No one is arguing that the words "knew her not" don't refer to sex. Duh.
The point being argued is that "till" does not have to mean what you think it does. Especially in the Greek.
There is no reason at all to look for another meaning when that one is perfectly clear.
Exactly why you remain purposefully ignorant. Since there exists a "clear" meaning, you insist that must be the only possible one.
This is a logical fallacy. Words can mean more than one thing.
Now, if you care to engage in a real conversation, you could begin by identifying one person from Scripture who is a child of Mary. Just one.
SD