To illustrate the truth that the Christian's body is no longer their own, pastor/author Ray Ortlund writes the following:

I try to drive carefully. But when I happen to borrow a friend's car, I drive very carefully. I don't want to damage the property of a friend and return it to him all banged up. Even so, our bodies are the personal property of someone else. The only way we could say, "Who does he think he is, telling me what to do with my body?" is by not belonging to him at all. Did he shed his blood to cover our sins? Has he given his Spirit to make us new? If so, then we should glorify him even in our physicality, especially our sexuality.