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Castillo and Yar kiss
A kiss was when one person touched lips to another person to share affection. A kiss could also on occasion have other connotations, depending on the situation and the relation between the two individuals.
In 2268, the crew of the USS Enterprise visited the planet Platonius, where they encountered a race of individuals who claimed to follow the philosophies of Plato and called themselves Platonians. They had developed psychokinetic abilities due to the kironide in their food and Parmen attempted to use these abilities to control the ship's crew and force Doctor Leonard McCoy to remain on the planet. As part of this, he staged festivities in which he dressed several of the crew in Greek outfits and forced Nurse Christine Chapel & Spock and Captain James T. Kirk & Lieutenant Nyota Uhura to kiss each other. (TOS: "Plato's Stepchildren")
When Benjamin and Jennifer Sisko first met on Gilgo Beach in 2354, the two of them shared a kiss. The Prophets recreated this scenario in 2369 in the Celestial Temple as part of their observations of linear time and Commander Sisko explained that "As corporeal entities, humans find physical touch to cause pleasure." (DS9: "Emissary")
It was traditional for Ferengi that met the Grand Nagus to kiss his staff upon meeting him. (DS9: "The Nagus")
In 2366, Lieutenant commander Geordi La Forge ran a holographic program that featured a version of Doctor Leah Brahms based on her personality profile analysis by Starfleet. As he worked with her to solve a problem aboard the USS Enterprise-D, the two became intimate and before La Forge ended his use of the program, they shared a kiss. (TNG: "Booby Trap")
That same year, in an alternate reality, Tasha Yar and Richard Castillo kissed as he prepared to beam back to the USS Enterprise-C. (TNG: "Yesterday's Enterprise")
In 2369, Captain Jean-Luc Picard became involved in a relationship with Lieutenant commander Nella Daren. The two took to playing music together and Daren led Picard to a spot within a Jefferies tube that she described as being the most acoustically perfect spot on the Enterprise-D. They played together for a while and Geordi La Forge heard their music in engineering below, but when Data joined him, he could not hear it, as the two had broken off to engage in a passionate kiss. The two later shared one last kiss before Daren transferred off the Enterprise. (TNG: "Lessons")
A kiss could sometimes be given to show love for a family member, such as one's child or wife. In 2370, a replicant of Chief Miles O'Brien tried to give Molly O'Brien a good morning kiss, only for her to spurn it, her apparently being aware that something was wrong. Later, the same replicant kissed Keiko O'Brien, only for her to back away, leading him to suspect that something was wrong. (DS9: "Whispers")
In 2371, Commander Chakotay observed two crewmembers of the USS Voyager kissing in a turbolift in what he described as "an example of indiscreet shipboard fraternization." The incident led him to speak with Captain Kathryn Janeway regarding the possibility of developing a policy regarding fraternization onboard the ship, though Janeway was wary of the idea, as Starfleet was reluctant to regulate peoples' personal lives. (VOY: "Elogium")
In 2372, Lieutenant commander Jadzia Dax and Major Kira Nerys participating in a holosuite program based on King Arthur's Court in Camelot. In the program, Lancelot kissed Major Kira and she knocked him out, as she was playing a married woman and was unfamiliar with the storyline. (DS9: "The Way of the Warrior")
That same year, Jadzia Dax was reunited with the Kahn symbiont, as Lenara Kahn. One of the Dax symbiont's previous hosts, Torias, was married to Kahn's previous host, Nilani. Despite a strict Trill taboo regarding Reassociation, Jadzia attempted to rekindle their previous romance and the two shared a passionate kiss. (DS9: "Rejoined")
A kiss was a common part of a wedding ceremony once the bride and groom were declared to married. In 2374, Worf and Jadzia Dax shared a kiss at their wedding following Sirella's declaration that they were married. (DS9: "You Are Cordially Invited")
That same year, when Hirogen took control of the USS Voyager and placed the member's of the ship's crew into holographic scenarios, Seven of Nine, believing herself to be a lounge singer in the night club Le Coeur de Lion sang "Wrong / Would it wrong to kiss / Seeing I feel like this / Would it be wrong to try?" from the song "It Can't Be Wrong". (VOY: "The Killing Game") Later, during that same simulation, Lieutenant Tom Paris, believing himself to be Bobby Davis, recalled a kiss he had shared with Brigitte (Lieutenant B'Elanna Torres's holographic alter ego) during the courtroom scene of the film I'm No Angel. Brigitte admitted that the film itself was not exactly burned into her memory, but she did remember the kiss. (VOY: "The Killing Game, Part II")
In 2375, Commanders Chakotay and Valerie Archer (a member of Species 8472 in Human disguise) shared a kiss, ostensibly as part of 8472's training to learn more about the human species. In actuality, however, the kiss was a ruse initiated by Archer to obtain a sample of Chakotay's DNA, as the 8472 replica of Boothby had become suspicious regarding Chakotay's true nature. Later, however, after the crew of USS Voyager and Species 8472 made peace, the two shared another kiss. The Archer replica asked if it was any better than the last time and Chakotay described her as a "quick study." (VOY: "In the Flesh")
In 2376, The Doctor fantasized about Seven of Nine giving him a lingering kiss on the cheek in a daydream in which he became the Emergency Command Hologram. Later, after he was awarded the Starfleet Medal of Commendation for his part in stopping a raid of Voyager by the Hierarchy, Seven actually did gave him a kiss on the cheek. She stated, however, that it was a platonic gesture and that he shouldn't expect him to pose for her, a reference to another of his daydreams in which he had painted her in the nude. (VOY: "Tinker Tenor Doctor Spy")
That same year, B'Elanna Torres crash landed on a L-Class planet where she encountered a playwright named Kelis who created a play based on the adventures of USS Voyager. At one point, Kelis's draft for the play contained a large amount of kissing, including Captain Kathryn Janeway kissing Commander Chakotay, Lieutenant Tom Paris kissing Seven of Nine and Ensign Harry Kim kissing the Delaney sisters. Torres was not impressed by this and suggested a new direction for the play, leading Kelis to come up with a new idea in which Captain Janeway argued passionately with the Borg Queen for peace. Torres felt that this idea was "much better than all that kissing." (VOY: "Muse")
In 2378, while on their fourth date, Commander Chakotay and Seven of Nine shared their first kiss. Seven initiated the kiss, explaining that she wanted to alleviate the tension because she had been told that anticipation of the first kiss is often uncomfortable. Chakotay asked what she had been told about the second kiss and she replied that she would have to check the database, but he interrupted her by initiating the second kiss. (VOY: "Endgame")