Sexual Immorality References

For of this you can be sure: No immoral, impure or greedy person—such a person is an idolater—has any inheritance in the kingdom of Christ and of God. 6 Let no one deceive you with empty words, for because of such things God’s wrath comes on those who are disobedient (Ephesians 5:3-7).

Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor men who have sex with men... will inherit the kingdom of God (1 Corinthians 6:9-10).

19 The acts of the flesh are obvious: sexual immorality, impurity and debauchery... I warn you, as I did before, that those who live like this will not inherit the kingdom of God (Galatians 5:19-21).

It is God’s will that you should be sanctified: that you should avoid sexual immorality; that each of you should learn to control your own body in a way that is holy and honorable, not in passionate lust like the pagans, who do not know God; and that in this matter no one should wrong or take advantage of a brother or sister. The Lord will punish all those who commit such sins, as we told you and warned you before. For God did not call us to be impure, but to live a holy life. Therefore, anyone who rejects this instruction does not reject a human being but God, the very God who gives you his Holy Spirit” (1 Thessalonians 4:3-8).

Every list of immoral sins lists at least one form of sexual immorality. See for those lists plus other verses on sexual immorality:
Matthew 19:17-19
Luke 18:19-20
Romans 1:24, 28-32
Matthew 15:19
Mark 7:20-23
Acts 15:20, 29, 21:25
Romans 13:9, 13-14
1 Corinthians 5:11
1 Corinthians 6:18
Galatians 5:19-21
Ephesians 5:3-7
Colossians 3:5-9
1 Timothy 1:9-11
Hebrews 13:4
Jude 1:7
Revelation 9:21
Revelation 21:8
Revelation 22:15