Why did the Mary remain a virgin even after the birth of Jesus?

Why did the Virgin Mary remain a virgin even after the birth of Jesus?

It is an interesting question, and it can be answered on both a divine and a human level.

In this video, Jimmy Akin explores both aspects of the question, showing why, on a human level, Mary would have chosen to remain a virgin and why, on a divine level, God would find it fitting to have his Son born of a woman who remained a virgin for her whole life.

In the process, Jimmy quotes from from a little-known document from the A.D. 100s that sheds some light on the question.