Great Sermon! This is one of the most effective sermons on how to approach marriage and the dangers of recreational dating. However, note that he misrepresents the Law's view of premarital sex: It does NOT constitute automatic betrothal. Though the seducer must pay the girl's father the bride-price and offer to marry her, the father has the option of taking the cash while declining to give his daughter. Again, this reinforces the principle of headship which the preacher, otherwise, so strongly presses home.
Added note: This listener is confusing two different scenarios.