15Do you not know that your bodies are members of Christ? Shall I then take the members of Christ and unite them with a prostitute? Never!
16Or don’ t you know that he who unites himself with a prostitute is one with her in body? For it is said, “The two will become one flesh.”
17But he who unites himself with the Lord is one with Him in spirit.
— 1 Corinthians 6:15-17

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Article by Joe Beam

So what does the Bible say about all of this? Joe Beam addresses what is Biblically appropriate and not appropriate for Christians in their sexual relationships.