If you find a man who smiles, don't let him go. He will be involved in multiple things, learning and growing. You might lose him to his passion for a short time, but he will always come back to you. He will want to share what he's doing — with you — and will also want to hear about everything you're doing.
He might propose to you via video chat or at a concert with his voice screaming above the din or poolside with a margarita in-hand or while walking through a bustling downtown. He is passion incarnate, so when his love reaches that level, it will be uncontrollable. It will burst to get out.
So find a guy who smiles. Why? Because you deserve it! As a woman, you have a right to all the happiness, energy, passion, desire and laughter that life can bequeath you. If you are looking for a drama-filled existence or a life unexamined, you are better off with a different type of man. But if you want a life that is fiery and filled with joy, date a man who smiles.