The bible speaks against sleeping with someone that you are not married to. It is a sin. You are defrauding, stealing and taking advantage of the person.
“For this is the will of God, your sanctification: that you abstain from sexual immorality; that each one of you know how to control his own body in holiness and honor, not in the passion of lust like the Gentiles who do not know God; that no one transgress and wrong his brother in this matter, because the Lord is an avenger in all these things, as we told you beforehand and solemnly warned you.”
1 Thessalonians 4:4-6
Having sex with a person that you are not married to is spiritual theft and you are being exposed to spiritual nakedness
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