The answer to this question depends somewhat on what is meant by “living together.” If it means having sexual relations, it is definitely wrong. Premarital sex is repeatedly condemned in Scripture, along with all other forms of sexual immorality

but should write to them to abstain from the things polluted by idols, and from sexual immorality, and from what has been strangled, and from blood. Acts 15:20 (ESV)

Food is meant for the stomach and the stomach for food”—and God will destroy both one and the other. The body is not meant for sexual immorality, but for the Lord, and the Lord for the body. 1 Corinthians 6:13 (ESV)

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