There are three forms of love described in the Christian Greek scriptures - EROS, PHILIA AND AGAPE.
EROS - Is the passion for the opposite sex that constitutes the emotional incentive to conjugal union. It is lust.
PHILIA - Is a feeling of warm personal attachment or deep affection as for a friend, for a parent or child, brother, sister or a relation. Usually the person is well known and your association or relationship demands the love as a duty.