Jami` at-Tirmidhi - Book 1, Hadith 86
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Urwah narrated from Aishah that: "The Prophet kissed one of his wives, then he went to the prayer and did not perform Wudu." He (Urwah) said: "I said 'Who was it except you?'" [He said:] "So she laughed."
How the Prophet ص modelled this behaviour here
Affection & Tenderness
“The Prophet kissed one of his wives”
Openly expresses love, affection and tenderness to his wife through warmth, closeness and kind gestures.