[Aquinasfan]

God created Eve for Adam, because "it was not good for Adam to be alone." So the primary purpose of marriage is companionship.

How would marriage defined primarily as companionship be differentiable from friendship?

[Abigail Adams]

"How would marriage defined primarily as companionship be differentiable from friendship?"

Well, isn't your marriage different from a friendship?

It seems some people think that the only reason for sex is to procreate. This is likely the belief of most Catholics, from what I understand. The Song of Solomon talks about a physical relationship between a man and a woman (as well as between Christ and the Church), and it's obvious that sex is a very enjoyable activity, created and blessed by God.