Before internet it was unknown. Because of internet videos women now have new expectations for size and stamina. It is not about past relations with foreign men it is about relations that happen during the marriage. The local man who is of insufficient size and stamina knows that his wife finds satisfaction from men of other lands. The cuckolded man wants it to be a secret but it soon becomes known to all that he is a man with an unsatisfied wife. Hence there are men who say No I will not be a cuckold and so that man does not get married.