It is written:
“Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body.” (1 Corinthians 6:18)
One of the gifts which God gave to humanity was the gift of sex (Genesis 1:28-29; 1 Corinthians 7:1-5). This gift was given to those in God-approved marriages (Song of Solomon). Sadly, mankind has corrupted this gift in many ways. The Apostle Paul reminds us that sexual sin actually harms the body of the person committing the sin. While this is evident especially in regards to such things as sexually transmitted diseases, there are other ways it is show to be true.
In discussing the different chemicals released in the male and female brains especially during intercourse, scientists have noted the effects of such on the “casual sex” that is so common in human culture:
“Just like dopamine and oxytocin, vasopressin is values-neutral. If a male enters into a physical relationship with a female unwisely, he could bond to her. This bonding could lead to a long-term relationship that is unhealthy and destructive because it was an unwise relationship to start with, yet the bonding keeps the couple together, even if the man is being abused by the woman. As with dopamine and oxytocin, vasopressin has a powerful impact on human behavior. Yet most people are totally unaware of it. Men may question why they keep going back to a woman who treats them poorly or may wonder why they never seem able to feel, deep inside, a commitment to a woman after having sex partner after sex partner. Sadly, they simply do not know that their brains are flooded with vasopressin during sexual intercourse and that this neurochemical produces a partial bond with every woman they have sex with. They do not realize that this pattern of having sex with one woman and then breaking up and then having sex with another woman limits them to experience only one form of brain activity common to humans involved sexually—the dopamine rush of sex. 31 They risk damaging a vital, innate ability to develop the long-term emotional attachment that results from sex with the same person over and over. This transition can be seen in the brain studies of individuals who have been involved with each other for a period of months. 32 The individual who goes from sex partner to sex partner is causing his or her brain to mold and gel so that it eventually begins accepting that sexual pattern as normal. For most people this brain pattern seems to interfere with the development of the neurological circuits necessary for the long-term relationships that for most people result in stable marriages and family development. The pattern of changing sex partners therefore seems to damage their ability to bond in a committed relationship. 33 Their inability to bond after multiple liaisons is almost like tape that loses its stickiness after being applied and removed multiple times.” (Freda McKissic Bush, Joe S. McIlhaney Jr., Hooked: New Science on How Casual Sex is Affecting Our Children, 42-43 (Kindle Edition); Chicago; Northfield Publishing)
No matter what sins we have committed, God offers pardon and forgiveness to all:
1 Corinthians 6:9-11 (ERV)-Surely you know that people who do wrong will not get to enjoy God’s kingdom. Don’t be fooled. These are the people who will not get to enjoy his kingdom: those who sin sexually, those who worship idols, those who commit adultery, men who let other men use them for sex or who have sex with other men, those who steal, those who are greedy, those who drink too much, those who abuse others with insults, and those who cheat. 11 In the past some of you were like that. But you were washed clean, you were made holy, and you were made right with God in the name of the Lord Jesus Christ and by the Spirit of our God.