When I was in college, I had this "friend" who, when we went out on the town, in a bar, or club, would walk right up to women and ask them if they wanted to fuck. Just like that, it was embarrassing. But he persisted. I asked him, why do you keep doing this when such an approach almost never is successful. He simply replied, because, when she says yes, I know that I have a sure thing. It saves a lot of time.