[Vigilanteman]

Once upon a time, Sperm Banks were mainly for childless married couples where the man had trouble producing viable sperm and they tried their best to match up with a donor with similar characteristics.

They weren't intended to be for Lesbians who wanted to mate with turkey basters.

[Mrs. Don-o]

There are therapies which can help men with low sperm counts successfully impregnate their wives. Anything that assists marital intercourse in achieving its procreative potential is a good thing.

The practice of being impregnated by another man, however, is basically out-of-wedlock reproduction. This is true even though the child's legal parents (one of whom is not his biological parent) are married. It is introducing a nonmarital reproductive partner into the mix. It violates the natural (genetic) father's bond to his own child, and is planned, set up to do that deliberately as a means to an end.

The "end" is great (having a baby) but the means chosen is morally problematic.

[tbw2]

Or single women to make babies because they cannot find a man or keep one.