Romantic or Sexual Interest: He could be signaling attraction, using touch as a way to express romantic or sexual interest and build a sense of closeness.
Affection and Comfort: In the context of a close relationship, the gesture may reflect comfort, warmth, or emotional connection, showing that he feels at ease around you.
Playful Intent: Touch can also be lighthearted. He might be using it to create a fun, teasing, or flirtatious mood.
Control or Dominance: Depending on the situation, touch might be a way of asserting influence or establishing dominance during an interaction.