Kiss

A kiss is a form of interpersonal expression between two people that is native among many human and humanoid cultures. It is used to express various forms of love, whether it would be familial love, mutual friendship, or deep romantic love. This form of expression is also native to the Smurfs in mainstream media.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, the kiss is Smurfette's personal expression of gratitude to her fellow Smurfs as well to Papa Smurf, and it is her personal expression of motherly love to Baby Smurf. However, until she met Empath, all of her kisses were planted on the cheek of another Smurf, indicating that she thought highly of them as friends (and in the case of Papa Smurf, as her father). On the night following Gargamel being permanently driven from the Smurf Forest along with Azrael and Scruple, Smurfette engaged Empath with a kiss on the mouth, which at that point was the most intimate expression of love she had ever shared with another male Smurf. The kiss had the effect of bonding Empath and Smurfette together as future life mates with each other, a prophetic marker that would be fulfilled with their marriage ten years later.

Kisses among male Smurfs of the same age in the story series are considered a rare occurrence, if they even happen at all, and would hardly reach the point of being passionate expressions of love in the same manner as male and female expressions of love. However, Empath, upon his being revived from the coma he had fallen into following his return to the village at the end of The Lost Year, was so excited to be alive that he kissed his friend Polaris Psyche on the cheek...an expression that Polaris found somewhat repulsive if understandable in the context it was given.