If I see a beautiful girl on the street and want to meet her, how can I officially offer her to go for a cup of tea with me?

"I want to fuck" and "I don't want to be single anymore" is a completely different motivation for dating a girl. And girls under each of these motives should be chosen differently, because among us there are those who enjoy sex without commitment. They don’t want any attachments, and those who want a serious relationship want to take care of someone. This does not mean that the last sex do not want - they need time, because it is not so much about your external attractiveness, but about character, lifestyle, habits. Imagine that you need to choose a driver with whom you will drive in the car for a day, and a partner with whom you will work together for a long time. Agree that the selection criteria will be different, and you will think longer. And you choose the one that wanted to create a couple, and are dissatisfied then that she did not give on the first request, or the one that wanted to walk (per at your expense - but not the fact), and you are upset that you are not put in a penny, and are ready to walk not only with you.
P.S Yes, you are angry: "You find yourself fools". You are the one who comes to know us. And, unfortunately, on your forehead at that moment is not always written what exactly you want, and they say the same - and the seeker of adventure, and tired of loneliness. To figure out who lies, it takes time, and at least some experience.