Jesus Christ talks about adultery in the heart: Matthew 5:28: 28But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart. Jesus Christ has the power to forgive, only God knows the heart.

Romans 1:26-27 and the Reprobated mind.

26 Because of this, God gave them over to shameful lusts. Even their women exchanged natural sexual relations for unnatural ones. 27 In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed shameful acts with other men, and received in themselves the due penalty for their error.

1Corinthians 6:9-10 and the lost.

Or do you not know that wrongdoers will not inherit the kingdom of God?Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers, nor men who have sex with men 10 nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God.

Jesus Christ warns humanity about fornication. 

Biblical viewpoints: sex is not merely a physical act but a spiritual, emotional, and energetic "one-flesh" union. Here are the key aspects of this belief based on the search results: 

  • Spiritual Exchange and "One Flesh": Sexual intimacy creates a deep spiritual union ("becoming one flesh"). When this occurs outside of marriage, this exchange is believed to take place without God’s protection, allowing for the transfer of negative energies, spirits, and burdens between partners.

  • Soul Ties and Baggage: Improperly bonded sex can lead to "soul ties" or "psychic cords," which can attach you to a partner’s emotional, spiritual, or mental baggage.

  • "Spiritual Sponge" Effect: During such sexual encounters, individuals can become a "spiritual sponge," absorbing the consciousness, negative emotions, and burdens of the other person.

  • Consequences on Well-being: The result can be that you take on the other person’s trauma, brokenness, or spiritual turmoil, which may feel like a heavy emotional or spiritual weight. This can lead to personal spiritual blockages or a sense of being burdened, drained, or haunted by the other person's issues.

  • Separation from God: In biblical terms, fornication is considered to "separate a person from God" and damage the body, which is intended as a temple of the Holy Spirit. Galatians 5:19-21: Lists sensuality among works of the flesh. Those who DO NOT inherit the kingdom of God.

  • Ephesians 4:19: Describes the ungodly as giving themselves over to sensuality.

  • Romans 13:13: Exhorts believers to behave properly, not in sexual promiscuity and sensuality.

  • 1 Peter 4:3: Mentions living in sensuality as a past life that should be abandoned.

    King James Version (Matthew 7:21-23)Jesus said:

    21” Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.

    22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?

    23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.”

Romans 7:2-3

English Standard Version

For a married woman is bound by law to her husband while he lives, but if her husband dies she is released from the law of marriage.

Accordingly, she will be called an adulteress if she lives with another man while her husband is alive. But if her husband dies, she is free from that law, and if she marries another man she is not an adulteress.

1 Corinthians 6:9-10

New International Version

(9) Or do you not know that wrongdoers will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor men who have sex with men (10) nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God.

Night sky with full moon and trees, with a Bible verse overlay about watching and praying to avoid temptation, citing Matthew 26:41.