>>29100639>>29100757>>29101494"Cuckold" doesn't just mean "being cheated on", it means being tricked into raising another man's child. It explicitly refers to men in this situation, at least before /pol/ ruined it.
Why do you think the cuckoo is called that? It lays its eggs in the nests of other birds.
tl;dr human girls cannot be cucked, only cheated on. Cucking is another level entirely