Of these three relationships, the Scriptures only speak of romantic attraction and desire being expressed in marriage.Song of Songs gives a beautiful picture of the feelings and expression of romantic desire and attraction.
The Song of Songs, the dialogue between King Solomon and his bride, is a celebration of the romantic and physical love between a husband and wife.
Song of Songs -11 says "How delightful is your love my sister, my bride!
How much more pleasing is your love than wine, and the fragrance of your perfume than any spice." Only in marriage may a man and woman enjoy expressing their romantic and sexual desires toward each other.
However, the Bible does describe three kinds of relationships with the opposite sex and gives certain characteristics of each relationship (there are others such as parent/child and sibling, but they don't clarify the issues of dating).
One kind of relationship the Bible describes is friendship.
God is our Father and other Christians are our brothers and sisters in Christ. Our Father deeply loves and desires that we show love to each other, that is seek each other's highest spiritual good.