From the eyes of a normal human, they have bonded a mother with a sense of safety and security. By finding a girl like their mother, they reinstill that kind of safety and security into that woman.
guyz.. ALL of Freud's theories were wrong.. the reason he's so famous is coz he introduced the process of thinking up theories and testing them in psychology.. not because what he said was right..
They don't marry them for protection and security but what helps initially attract them to her is someone who gives them a feeling of protection and security.