Horned Animals and Herd Diversity

I had a professor in college who, once, while talking to my class about the issue of adultery, said something that made us laugh. But later, I realized that maybe he hadn't said it as a joke and really meant it that way:— If a man doesn't know that his wife is cheating on him, he is not a cuckold. He will only be a cuckold if he knows and does nothing about it, accepting and maintaining that situation.