Is premarital sex a sin?

1 Corinthian 6 vs. 18 – Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.

1. Yes the Bible describes it as a sin against your body.
2. This means your body will be affected with some evils, every time you commit fornication.
3. These evil may include sickness, demonic possession, ill-favour, bad luck etc.