It is hard for people to erase their memories of what happens during it when they are finally with that "special someone" months or years later.
As more parts of the sexual relationship are saved for marriage, they then become more special since they are not besmirched by guilty thoughts when done with their life partner.
It may be the first "stop" for the "train" that ends with penetration and orgasm at the final "destination," but it is still part of same general process.
It can easily be a sexually charged "warm-up" that prepares for consummation even when the couple ultimately avoids going that far.
The answer to this question all depends on the purpose of the act and what is going on in the hearts of those participating in it.
For example, it was clearly not wrong in the early New Testament church for believers to kiss as a sign of greeting, friendship and mutual affection (Romans , 1Corinthians , 2Corinthians , 1Thessalonians , 1Peter ).
For further study, see Joshua Harris' book "Boy Meets Girl," especially pages 141 - 166, where he reasons carefully about why he rejected kissing his future wife before they got married.
Way to go in thinking ahead, making plans, and setting boundaries in your relationship so that you can honor God and one another in the process.
Fast forward 15 years from the very first time I heard about this concept – and my perspective on this topic has shifted.
You see, now I’m a licensed professional counselor, sitting in my office, working with hundreds of couples, I actually see the other extreme of these hard and fast rules: more specifically, couples who have come to see me due to the backlash of their lack of comfort with physical intimacy — even in marriage.
There’s so much to be said here, but in an effort to stay away from the “shame-based” approach toward physical interaction – and to answer your question frankly: no, I don’t think you need to wait until marriage to kiss.
This is where it crosses the line and has the potential to lead to other self-serving sexual acts.