Here’s a mug designed with a thin contour at the top that’s slightly curved to conform to your lips. I can only speak for myself, but I’ve been consuming liquid beverages all my life and I haven’t found a need to buy myself a special cup due to unwanted spillage or slobbering all over myself.
But if you’re someone who can’t manage to drink your morning coffee without spilling it all over yourself, maybe this would help. A sippy cup is probably far more traditional, however. I would suggest that if you’re an adult and find yourself needing a special cup, then you probably need a special hemet as well.