Here are some of the bible passages we have used with our sons to discuss "to date or not to date".
(From Focus on the Family)
1 Corinthians 6:9 - 7:19 Command to be pure, seriousness of sexual sin, and instructions regarding marriage.
1 Thessalonians 4:1-8 Do not wrong or defraud one another in relationships - by implying a relationship or commitment by your words or conduct that does not actually exist.
Song of Solomon 2:7 "Do not awaken love before it pleases" i.e. Before the proper time, meaning marriage.
Proverbs 6:20 - 7:27 Warning to avoid sexual sin and foolish relationships.
James 1:13-15 Temptation is to be taken very seriously.
Romans 13:8-14 Love others, work for their soul's good; don't look to please self.
Romans 14:1 - 15:7 Favor others, not self, value what's good to their souls.
1 Timothy 5:1-2 Treat single girls as sisters in Christ with absolute purity.
Titus 2:1-8 Young men and women should focus on self control and godliness.
John 14:15 If you love Christ you will obey His commands (above your own desires) and live biblically.
The goal - to be emotionally and physically intimate with only one member of the opposite sex, your spouse.
Read HERE. (Focus on the Family)
You can also learn more HERE.