Funny we should mention this because I did a small study on it to help a friend earlier this year.
Here is a direct copy from my file:
Regarding Fornication
Fornication: Voluntary sexual intercourse between persons not married to each other.
Acts 15:20,29 -- Resist fornication.
Romans 1:29 -- Those who commit fornication are worthy of death.
1 Corinthians 6:13 -- The body is not for fornication, but for the Lord.
1 Corinthians 6:18 -- He who commits fornication sins against his own body.
1 Corinthians 7:2 -- To avoid fornication, let every man have his own wife, and vice versa.
1 Corinthians 10:8 -- The end of the world has come to those who have committed fornication.
Galations 5:19-21 -- Those who commit fornication shall not inherit the kingdom of God.
Ephesians 5:3-5 -- Those who commit fornication shall not inherit the kingdow of God.
1 Thessalonians 4:4 -- God wants us to abstain from fornication.
Jude 1:7 -- The people of Sodom and Gomorrah fornicated and will suffer eternal fire.
Revelation 2:14-16 -- Asks those who commit fornication to repent for this sin.
Matt 5:32 & 19:19 -- If one divorces for without a reason, and remarries, this is also fornication.