Because when you're going out and experimenting with different things, talking to girls, it's inevitable to get "rejected" many times, and this in turn makes you complacent with rejection. When you get complacent with rejection and the feelings, meaning you could not care less about it if a girl doesnt approve of you or wants to taste your tikka masala, it opens up a whole new world where you can be free from fear, effortless and just do what you want. It's fear of rejection which is holding most people back and the answer is really simple, just get out there and experience it enough until you dont care about it anymore.