OP, did you just learn about this now? This has been around for ages. I don't know much of the law, but I've heard of it since 2020.
They say it's there to "not disrupt the balance of the family" jfl. Regardless of if there is a reason, that's one way France is more cucked than the countries near to it.
In the case that a man breaks this law, proceeding evidence will not be admissible in a family court lmao.
I remember Colttaine highlighted that around 1% of children born become a part of literal cuckoldry, paternity fraud cases.
I guess what French authorities are worried about is that the man would become so enraged that he does a murder suicide on his wife. (Maybe, there was a case of that which enticed the creation of this cuck law. I don't know enough about it.)