Place the glutinous rice in a fine-mesh sieve and rinse under cold water until the water runs clear.
In a medium saucepan, combine the rinsed rice and water. Bring to a boil, then reduce heat to low, cover, and simmer for 20-25 minutes, or until water is absorbed and rice is tender.
In a separate saucepan, combine coconut milk, sugar, and salt. Heat over medium heat, stirring until sugar is dissolved. Do not boil.
Once rice is cooked, remove from heat and stir in coconut cream mixture and vanilla extract.
Transfer pudding to a serving dish or bowls. Cover and refrigerate for at least 2 hours, or until chilled and set.
Just before serving, top with diced mango.
If desired, sprinkle with sesame seeds for garnish.