The Church of Jesus Christ of Latter-day Saints, commonly called the Mormon Church, believes that families can be together forever. The Church also teaches that the power of procreation we have as human beings is a divine gift which comes with very serious responsibility. God gave us this power, but has instructed us to use it only in the way and manner He has instructed us to, which is within the bonds of marriage. Mormons believe that fornication and adultery are two of the worst possible sins, second only to murder and denying the power of God once one has received a sure knowledge. It is such a serious sin because the responsibilities which come with raising children are so important.
Aside from the sins and negative consequences which come from having sex before marriage, it is a wonderful thing to share this experience with your spouse, but if either or both of you has shared this experience with others already, the experience becomes cheapened.
There are also severe physical and emotional risks involved if you choose to have sex before you are married. There are so many reasons to wait and have it be a wonderful experience, but the only reason to not wait is to have immediate satisfaction. The world is teaching you now that this demand for immediate satisfaction is normal and acceptable, but that is simply not true. We do not have the right to use this or any other power in any way which contradicts the Lord’s commandment, though we certainly have the ability to do it. The choice is yours and is one which carries eternal consequences. You should respect anyone’s decision to wait until marriage.