Do you not know that your bodies are members of Christ? Shall I then take the members of Christ and make them members of a harlot? Certainly not! Or do you not know that he who is joined to a harlot is one body with her? For "the two," He says, "shall become one flesh." But he who is joined to the Lord is one spirit with Him. Flee sexual immorality. Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body. Or do you not know that your body is the temple of the Holy Spirit who is in you, whom you have from God, and you are not your own? For you were bought at a price; therefore glorify God in your body and in your spirit, which are God's.-1 Corinthians 6:15-20.
Yes, you read that scripture correctly, he that has sex with a harlot (prostitute) becomes one body with her. And since she has had multiple partners that became one with her, you become one with all of them. By committing fornication you are taking what belongs to Christ and giving it to whoredom. This scripture does not apply just to harlots. It applies to everyone.
This is why Apostle Paul stated the following,
"lest, when I come again, my God will humble me among you, and I shall mourn for many who have sinned before and have not repented of the uncleanness, fornication, and lewdness which they have practiced".- 2 Corinthians 12:21.
He refers to this behavior as uncleanness. God speaks strongly against fornication throughout the Bible. It is not a gray area that He tip-toes around. There are numerous passages that forbid fornication.
"But fornication and all uncleanness or covetousness, let it not even be named among you, as is fitting for saints;" - Ephesians 5:3.
God even refers to evil nations as harlots,
"For true and righteous are His judgments, because He has judged the great harlot who corrupted the earth with her fornication; and He has avenged on her the blood of His servants shed by her."-Revelation 19:2.