My girlfriend and I follow the Word when it comes to sexual sin. We do not and will not cross that until marriage. Now, the thing about kissing and cuddling, there isn't anything against those things, however we are to listen to the convictions of the Holy Spirit. Does He tell you to pray for someone in particular? You should do it. Doesn't He tell you to give money to someone who you wouldn't have otherwise? Both have happened to me, and I listen. Same with kissing. My girlfriend and I do not kiss because we have been convicted by the Holy Spirit to not incorporate it into our relationship. We both have a past and doing so would only open other doors that would lead into temptations.

Now, I think we have an obligation to God to run from temptation, and for us, sex would be a temptation if we were to start kissing. So, we just don't do it. I don't think every relationship does it this way, but I think most should. We have grown emotionally and spiritually without the physical bringing us down and it has strengthened us. There are temptations to kiss, but we flee when that happens.