Can you have one without the other? Carlos Flores says NO.

The social conservative observes that nature has providentially provided such an environment for the formation of a virtuous people who are ready to participate in (or establish) a political project: the family, where the child can depend on the love of his or her mother and father (and on the love between his mother and father) for his or her formation into a virtuous person. The child’s mother and father do more than this, however: they provide a representative of the two halves of humanity, man and woman, for the child to come to know and have a relationship with. In this way, the child can learn how to form relationships with persons of either sex and how to conduct him- or herself in marriage and relate to his or her spouse later in life.