You're talking about just talking to people in general, which is fine. Going from a woman not knowing you to allowing you to go balls deep in her that night is something you have to work for. Yeah, it's less difficult if you already have that personality, but I wouldn't call it an "art". It's just being confident and engaging, which naturally will make people like you. This is true both in sales and with women. The problem with a lot of guys is that although they may be interesting, funny, and engaging, women won't know because they're shy in front of chicks. That's why the biggest issue is the fear of rejection. That's it. You lose your game after a long relationship because you haven't been "rejected" in a while and forgot to not care about it. The fear of rejection changes the way you speak to people. You're all of a sudden careful with your words, which makes your speech sound lame. You can end up acting nervous.
I feel like we're just saying the same thing really.