I have some pertinent verses here that pretty much spell it out how God feels about pre-marital sex:
Jesus said in Matthew 15:19:
"For out of the heart proceed evil thoughts; murders, adulteries, fornications, thefts, false witness, blasphemies."
Paul said in 1 Corinthians 6:18:
"Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against is own body."
Fornication separates us from God! Paul said in 1 Corinthians 6:9:
"Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived; neither fornicators, nor idolators, nor adulterors, nor effeminate (homosexuals), nor abusers of themselves with mankind."
Fornication divides the body of Christ. Paul said in 1 Corinthians 5:9:
"I wrote unto you in an epistle not to company with
fornicators."
It is the will of God that you abstain from sex until marriage. In 1 Thessalonians 4:3-4 it says:
"For this is the will of God, even your sanctification, that
ye should abstain from fornication. That every one of you should know how to possess his vessel in
sanctification and honour."
What is fornication? Taken from Webster's online dictionary:
Main Entry:
for·ni·ca·tion
Pronunciation: "for-n&-'kA-sh&n
Function:
noun
: consensual sexual intercourse between two persons not married to each other
It is inconsequential, really, whether or not having sex with someone outside of marriage would bring you closer together (which, in almost all cases, it does not in the long-run) or breaks you up. The only thing which matters is that God's Word is quite clear that fornication (sex outside of marriage) is a sin and that the sin separates you from God. It is one of the most tempting because at first it doesn't seem like it brings an consequences such as raping, muder, or stealing. The Bible does not deny it will feel good, but the rewards of waiting until the proper time (marriage) before having sex far outweigh the fleeting pleasures.