This sermon is excellent on the biblical principles courtship. It also addresses the legalism if we go too far. It's about the heart and not rules.
and said, ‘Therefore a Man shall leave his father and his mother and hold fast to his wife, and the two shall become one flesh’? Matthew 19:5 (Emphasis mine)
http://www.sermonaudio.com/sermoninfo.asp?SID=11711931483
