You had mentioned that you knew the consequences of sex, but have you thought this out fully? For example, what if death is not imminent, but you become pregnant, give birth, and then die and leave a child orphan? Or what if you live and the father dies? Either way, the child's memory of his parent is that she knew she was going to die, so she preferred sex, regardless of the consequences. What if either one (or both) of you lives, and then goes on to marry another person? What about the heart of that person's future spouse?
In high school, several of my friends died. Through their deaths, I learned that we never know how many days we've been given, and we should love to the fullest with the time we have. But this love must be based on the truth about what is good for the other, not just the passing pleasures of this life. While sex right now might seem like an oasis in a desert of suffering, I promise you that it is a mirage. It promises everything, but does not deliver. That's why nearly 80% of teenage girls regret losing their virginity.[1] You sure don't hear about that statistic on MTV.
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[1]. National Campaign to Prevent Teen Pregnancy, "America's Adults and Teens Sound Off About Teen Pregnancy: An Annual National Survey," (December 16, 2003), 17.