There is something very personal to touching a person's hair in the right situation.

I smiled, and reached out a hand to touch her hair.

I put out a hand again and touched her hair.

My hand could touch his hair from here, he wouldn't even know.

After a very long moment, she moved her hand to touch his hair.

He reached out his hand and just touched my hair.

He reached out and touched my hair for just a second.

They smiled at him, then reached up to touch his hair.

He wanted to touch her hair, run his fingers through it.

He wanted to reach out and touch her hair, but wouldn't allow himself to do it.