generally, we are... lol... probably a trait handed down through family values, though a little more intimacy isnt considered taboo as it used to be, generally parents still frown on too much of it... the no-sex-before-marriage sentiment's still strong in society, which's probably why there's more restraint among asians compared to other races...
also, it's more difficult for children to touch on sexual issues with parents, so usually asian couples dont openly show affection for each other in front of their parents... i guess we tend to consider intimacy as something highly personal and therefore prefer to keep it private rather than openly kiss in public...

sexuality exists in all people, i think... the difference lies how each person handles or controls it...