[RnMomof7]

What vows of chastity among Jews? They can be found right here (just a warning, you might not like it because it speaks DIRECTLY about vows continuing EVEN DURING MARRIAGE):
Numbers, Chapter 30

So where do we find Mary's and Joseph's vow??

[wagglebee]

Get back to me when you can find the portion of Scripture that includes their marriage vows.

[wagglebee]

If you knew a young woman who was about to be married (let's assume that she's not on the Pill or something along those lines AND that she is a virgin which is quite rare today but wasn't 2000 years ago) and you said to her, "you are going to conceive a child."

What do YOU think this young woman's reaction would be? Would she say, "How can this be, I've never had sex?" No, because she would assume that the future event you were talking about would happen AFTER she married, she and her husband would have intercourse and conceive a child. The expected response from the young woman would be one of excitement, maybe a little apprehension, but mainly excitement and joy.

The Blessed Virgin Mary's response in Luke 1:34 ONLY makes sense if she NEVER INTENDED to have intercourse.