Question:
If two who are dating sleep together, should they feel obligated to get married?

Answer:
Not necessarily. If a casual relationship leads to sex before marriage, it is sin; it must be owned that it is sin in sorrow to the Lord, to the one you sinned against, and you should not do it again.

A marriage should not be based on sin. However, if a child is conceived, each parent is responsible to provide for that child.