Proactivity,
How do most guys who make it out of their school years single meet women?
Social, work, and event circles.
Only using these types of circles severely limits your pool of women, which is the main problem with it. But if you have good fundamentals (and you have had some experience dating women and sleeping with women in the past), you can usually net one of the higher quality women in these circles. The difference here is that the goal for men at this point is usually "get the higher quality(ish) one from the circle, knock her up, and settle down."
So if your goal is to bang lots of attractive women over a longer period of time, you're probably going to want to learn cold approach. The only other alternative is to be good at constantly shifting between new and old circles and expanding your social circle endlessly, which of course brings with it new potential lovers. But it's still a tedious process (at least from the eyes of an experienced cold approacher), and
you'll have to be very comfortable with meeting new people and making friends easily.
- Franco