12 Everything is permissible for me— but not everything is beneficial. Everything is permissible for me— but I will not be mastered by anything.
Okay, so I can see how this can used to say you ought not to let things go out of control, like letting masturbation become an addiction. Or letting a relationship with a girlfriend/boyfriend have too much emphasis on physical interaction rather than spiritual interaction.
The body is not meant for sexual immorality, but for the Lord, and the Lord for the body.
Makes sense, but it begs the question: what is sexual immorality?
5 Do you not know that your bodies are members of Christ himself? Shall I then take the members of Christ and unite them with a prostitute? Never! 16 Do you not 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.
This is where I think that Paul equates sexuality with coming together/unification/becoming one flesh, which (correct me if I'm wrong) is coitus and nothing else. Still doesn't solve the kissing/hugging/etc problem.
18 Flee from sexual immorality.
Okay, I can see how you can use this in conjunction with verse 12 to say "better safe than sorry, because we don't want to push it." But it doesn't explicitly condemn something like kissing. It would be the equivalent of saying drinking a chocolate shake from In N Out makes you guilty of gluttony.
I'm not really sure what you're getting at. Could you be more explicit?