True Christians desire a closer relationship with God. We believe in the resurrection of the dead, that one day we will be raised up and will be unable to sin. We will have perfect union with God. But if we truly desire that for the future, then we need to demonstrate our wish to be like God now, by controlling our harmful lusts and living in such a way as to please God. Our bodies were not meant for sexual immorality, therefore we should not use them for sexual immorality. Instead, by looking forward to the ressurrection, we should be motivated to live holy, pure lives while still on Earth:
The body, however, is not meant for sexual immorality but for the Lord, and the Lord for the body.14 By his power God raised the Lord from the dead, and he will raise us also. (I Corinthians 6:13b-14 NIV).
What we do with our bodies on Earth matters. Even those of us who are saved will be judged according to what we have done on Earth. We will receive rewards for the good that we do, and will suffer loss for the good that we do not do:
For we must all appear before the judgment seat of Christ, so that each of us may receive what is due us for the things done while in the body, whether good or bad. (II Corinthians 5:10 NIV)
their work will be shown for what it is, because the Day will bring it to light. It will be revealed with fire, and the fire will test the quality of each person’s work. 14 If what has been built survives, the builder will receive a reward. 15 If it is burned up, the builder will suffer loss but yet will be saved—even though only as one escaping through the flames. (I Corinthians 3:13-15 NIV).