Oh, yes, lets blame science, shall we?
Men can never inflict a cuckolding on women, but the implication is that we should hide this information from the man unless its absolutely necessary to tell him.
This is another example of liberal bias that has crept into law.
The law in the US (never written, but assumed from old english law by liberal judges) is that the man of the house is de-facto assumed to be the parent, regardless of what the DNA says. While this might have worked in days when men had some control over their wives social outings, this situation does not exist anymore, and no man can make his wife stay home. Yet the old rules persist.
Men should be able to at the very least obtain child support payments from the boyfriend, but I've never heard of this happening.
This has ALWAYS been a problem. That is why the law developed the legal presumption that children born into a marriage are the offspring of the marriage.