The question is, is it okay to kiss?
Yes and no!
Mind you, there is nothing wrong or bad about kissing itself, as in the action – the act. But, to be sincere, this depends on the situation and the context.
This question is for those asking about romantic kiss(ing); so, let me break it down.
If you are not practicing sexual purity, if you are not interested in sexual purity, then this is not for you.
Just so you know, naturally and ordinarily, kissing (just like sex) is not sin; it is not a bad thing at all. It is a way of expressing intimacy and a way of showing affection.

According to studies, it is believed that dopamine helps to reinforce enjoyable sensations and behaviours by connecting things that make you feel good with the urge to do them again. This connection is an important factor in the development of addiction.
Neurotransmitters, also called chemical transmitters or chemical messengers are what our body can’t function without. They carry chemical signals from one nerve cell to the next target. The transmitters that cause feelings of pleasure and euphoria are: oxytocin, endorphin, and serotonin.
So?
Kissing is very powerful that it triggers the brain to release chemicals like oxytocin, dopamine, and serotonin, and these make a person have a “so good” feeling about it that they desire more.
Just so you know, oxytocin stirs up feelings of affection and attachment, and it causes bonding.
People have been asking this question so much that it is obvious that some of them really want an excuse to kiss; the urge and appetite is very strong!
Well, kissing is not sin to some people, but it is to others!
It is not counted as sin for married people, but it is to unmarried partners. This also depends on the type of kiss, though.
Kissing your children, parents, siblings, and loved ones (on the cheek) is a way of expressing affection and care, and it is very okay.
In some societies and settings, kissing of one’s hand is a form of greeting or reference/respect, etc.
In some royal settings, kissing of the King’s/Queen’s ring is a sign of obeisance.
Giving a peck (on either or both cheeks) is a form of greeting in some cultures/settings.
Apart from the aforementioned or any other form of “kissing” greeting or respect; anything kissing that is intimate is a sexual activity. If it is intimate; romantically or sexual, there must be a spark, a rush, even if there isn’t, it does not just happen out of the blue; there is always an intention to enjoy the pleasure that comes with the heat of the moment, maybe from one of the partners; and this is not good for someone practicing sexual purity (a Christian).
When it comes to romantic or sexual aspect, there is no kiss with “pure” intention, trust me. That pure intention is wrongly regarded. There is something the initiating partner wants.
They want to FEEL you, have a taste of you, wanting to experience the feeling, etc.
It is wrong!
Yes, you can hold hands and hug, those are not exactly sexual activities; we hug our siblings, friends, relatives, colleagues, and hold hands, remember? And this hardly leads (almost does not) to sexual arousal or stimulation, naturally…except for some people and in some contexts.
As weird as this may sound, there are some people who get turned on when they get very close to their love interest, sometimes when they start talking, sometimes when they hold hands; these happen to empaths most times because they feel people’s emotions and feelings, and because of this, they should learn to control their absorption.
Empaths feel and absorb energies around them more than normal people, I am saying this because I am one (an empath).
But, on a normal day, inability to control one’s self is a thing of concern, and an urgent solution is advisable.
This goes to determination and mind control – practice them as much and often as possible.. It is nothing sexually stimulating or intimate, and anyone who says it is is just being dramatic or ignorant.
Kissing between two romantic partners can cause sexual arousal, and if you are a true believer you should know that any form of weakness or temptation that could possibly lead to sin should be entirely avoided by all means necessary and possible.
Again, trust me, it is best to avoid it, “every sort of temptation”; it lowers protective walls and exposes one to sexual energy. You become vulnerable gradually. And whether you believe it or not, it would certainly lead to the temptation of wanting more, and you would get consumed when it comes fully at you.
The best and safest thing to do is avoid it totally! Have a boundary!
Actually, as Christians, it is wrong to make out at all before marriage, because it opens us up to sexual vulnerability, and this certainly leads to sexual sin; fornication.
Sexual intimacy is not right for unmarried Christians, it opens the way for sexual thoughts, feelings, and fantasies.
Kissing/making out produces feel good chemicals in a person, and makes the person crave for more. Imagine what it means to have this situation lead to sex (you can’t control yourself when it gets to a particular level), you become so aroused that your body naturally gives in. This is why as Christians we must commit our fleshy/carnal appetite to God, it is the problem we have in the world. When there is no control over your appetite for sex, making out, etc. you become vulnerable for the devil to easily manipulate into sexual sin.
It starts with a thought, an idea, then the feeling, and eventually the action. The feeling would be developed, the thought would be entertained, and the devil (he uses what God created to try manipulating people) uses that to his advantage against the people involved.
So, it is not advisable, it is wrong, and it is dangerous.

I hope you understand.