First, I think maybe they think it's best to express their attitude through closeness, because if we hate a person, we may not let that person touch anywhere around you, let alone the mysterious and most secret position of mouth! You wouldn't do this to an annoying person, but if you were just an ordinary person, we might not do it either, because we might choose the position of our hands, which may be your greatest expression, but your mouth is a forbidden area that you must never let others touch! So only if you like it best and are willing to let others touch you, can you share your position with others to express how much you love him! Of course, this is also a prerequisite. If you are usually a reserved person, then your action may easily let others know that this is the embodiment of love!
Secondly, my mother will teach us that other people's mouths can't be kissed, and they will get pregnant if they kiss. I think many people should have heard of it when they were young, which also proves how important the mouth is. If someone you hate comes to give you a kiss, you may not be able to resist the impulse. This is what we should know, so the mouth is our secret, because our mouth is one of our very important organs. So this is also the object we should focus on protecting. Of course, not everyone will think so! However, I think people who have received classical education in China will think so ~
Therefore, we may choose to express our love for this person with our mouths, and when we kiss, we may know whether this person is the one you are looking for. Just like eating, we may choose what we like to eat instead of what we don't like to eat. Mouth is the best way for us to express our love, so it will help you find out whether this person is the person you like, so I think kissing with the mouth is a very good way to express our love. I think you can try it, so that you can know if this person is your favorite dish, so that you won't waste time and energy on strangers.