Kissing's naturalness is a complex issue with varying perspectives. While the impulse to kiss may be innate, the skill of kissing is learned and refined through experience.
The Innate Impulse
Many sources suggest an inherent human drive towards kissing. We observe kissing behavior in other social animals, and even newborns are often kissed. This points towards a possible biological basis for the desire. As one source states, "Kissing comes naturally," highlighting this inherent inclination. [Kissing comes naturally but our techniques can evolve. We're kissed from birth and other social animals seem to kiss, too.]
Learned Skill and Technique
However, simply having the desire to kiss does not automatically translate into skillful execution. Numerous accounts emphasize the learned aspect of kissing. One source notes that while kissing is "natural," one "gets better with a little time." [Kissing is natural but you do get better with a little time. Don't be worried about it. But a word of advice to you. Great kissing fires the...] Another source highlights the experience-based improvement: "It does not come natural to everyone." [It does not come natural to everyone. Don't feel bad if it didn't go well if he's a quality guy things will be good regardless.]
The act of kissing involves a blend of innate desire and learned technique. While the fundamental urge might be inherent, mastering the art of kissing requires practice and experience. This is supported by various accounts where individuals describe kissing as initially awkward before improving. [I remember kissing this girl, felt like making out with a corpse. That didn't...] The variation in experience also highlights that some individuals may naturally possess a greater inherent understanding or aptitude for kissing than others.
Conclusion
Kissing is a blend of instinct and learned behavior. The desire to kiss might be instinctive, but proficiency in kissing is developed through experience.