Of course the main drawback of this approach is the difficulty of realization. It is obvious that pretty women don't get into trouble every day and not always men are able to help her and be at right time and in right place. It is possible to stage a kind of incident and sometimes such approach can be very successful. Imagine such situation: your friend pretends to be on a bender, and begins to molest a pretty girl (that you have chosen with him beforehand) and you come up to them and severely explain the ?impudent fellow? to leave the lady alone. Of course not everybody can accept such way of acquaintance, first of all from the moral phase of the subject but it really works.

The factors that favor the success of this action are:
Masculinity
Force
Confidence
Breaking of stereotypes
Humanism
Concern
Nobility
Superiority over other men
Vividness of presented traits

If to speak about other ways of acquaintance, you should prefer the ways that are based on the following factors:
Humor
Curiosity
Compliments (to support the feeling of specialness of the lady)

Improvisation can guarantee a good result but in this case, much depends on the situation, location and surrounding. You can present flowers to a lady, and you will reach a success in 80%. By all means among the factors that favor this way we can name romanticism, gentleman's behavior and all factor, that were given above.

Of course, to find the way of dating, that contains all the factors look like the attempts to invent "perpetum mobile", every person will have to find the most suitable way for him, that will match his character, temperament, appearance, habits etc. If you are a man with a very good sense of humor, the way, based on humor will match you most of all, if you are a gentleman ? be courteous and you will achieve a success.