I found this interesting article about it.
Quote:
There is no Hebrew or Greek word used in the Bible that precisely refers to sex before marriage. The Bible undeniably condemns adultery and sexual immorality, but is sex before marriage considered sexually immoral? According to 1 Corinthians 7:2, “yes” is the clear answer: “But since there is so much immorality, each man should have his own wife, and each woman her own husband.” In this verse, Paul states that marriage is the “cure” for sexual immorality. First Corinthians 7:2 is essentially saying that, because people cannot control themselves and so many are having immoral sex outside of marriage, people should get married. Then they can fulfill their passions in a moral way.
Since 1 Corinthians 7:2 clearly includes sex before marriage in the definition of sexual immorality, all of the Bible verses that condemn sexual immorality as being sinful also condemn sex before marriage as sinful. Sex before marriage is included in the biblical definition of sexual immorality. There are numerous Scriptures that declare sex before marriage to be a sin (Acts 15:20; 1 Corinthians 5:1; 6:13, 18; 10:8; 2 Corinthians 12:21; Galatians 5:19; Ephesians 5:3; Colossians 3:5; 1 Thessalonians 4:3; Jude 7). The Bible promotes complete abstinence before marriage. Sex between a husband and his wife is the only form of sexual relations of which God approves (Hebrews 13:4).
Far too often we focus on the “recreation” aspect of sex without recognizing that there is another aspect—procreation. Sex within marriage is pleasurable, and God designed it that way. God wants men and women to enjoy sexual activity within the confines of marriage. Song of Solomon and several other Bible passages (such as Proverbs 5:19) clearly describe the pleasure of sex. However, the couple must understand that God’s intent for sex includes producing children. Thus, for a couple to engage in sex before marriage is doubly wrong—they are enjoying pleasures not intended for them, and they are taking a chance of creating a human life outside of the family structure God intended for every child.
While practicality does not determine right from wrong, if the Bible's message on sex before marriage were obeyed, there would be far fewer sexually transmitted diseases, far fewer abortions, far fewer unwed mothers and unwanted pregnancies, and far fewer children growing up without both parents in their lives. Abstinence is God’s only policy when it comes to sex before marriage. Abstinence saves lives, protects babies, gives sexual relations the proper value, and, most importantly, honors God.
I will give the scriptures that was provided above.
1 Corinthians 7:2: Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband.
Acts 15:20: But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood.
1 Corinthians 5:1: It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
1 Corinthians 6:13, 18: Meats for the belly, and the belly for meats: but God shall destroy both it and them. Now the body is not for fornication, but for the Lord; and the Lord for the body. Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
1 Corinthians 10:8: Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
2 Corinthians 12:21: And lest, when I come again, my God will humble me among you, and that I shall bewail many which have sinned already, and have not repented of the uncleanness and fornication and lasciviousness which they have committed.
Galatians 5:19: Now the works of the flesh are manifest, which are these; Adultery, forniation, uncleanness, lasciviousness,
Ephesians 5:3: But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
Colossians 3:5: Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
1 Thessalonians 4:3: For this is the will of God, even your sanctification, that ye should abstain from fornication:
Jude 1:7: Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.
Hebrews 13:4: Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
Proverbs 5:19: Let her be as the loving hind and pleasant roe; let her breasts satisfy thee at all times; and be thou ravished always with her love.