If a woman is not perfect, and has sin like all of us, does this effect her organs. Does it leave mud stripes in the flesh or is it contaminated?
Since no blood from the woman donor goes into the fetus, and the womb is like a fleshy eggshell, that doesn't leave traces of itself on that which was in it, how can this make the fetus unclean as you imply?
Jesus said he came for the sick, not the healthy, the sinner, not the righteous, and angered the scribes and Pharisees by spending His time with them.
Since He came for the sinner, does it seem reasonable that he would require a divine womb, or would he be born from a woman who represented those He came to save?
JH :-)