My personal experience is that unless you have a very solid, trusting, and loving relationship with your partner, that has gone on for a while, you may regret having sex too soon. This has nothing to do with Christian morals, but following them may actually be to your advantage.
Getting completely into my interpretation of Christian beliefs - if you are a Christian, then you have the Holy Spirit dwelling in you. When you have sex with someone, you are uniting not just yourself, but also the Holy Spirit with that other person. God allows only one union between a man and woman, that has been sanctified. Outside of that you are hurting the Holy Spirit. If you are unable to keep from having sex outside of a sanctified union, you are not alone. That seems to be the biggest weakness in any Christian today, including preachers, priests, etc. The whole thing has to do with how committed you are to God.
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