I did kickboxing for several years when I was younger, 13 fights undefeated. I was in it more for the fitness and competition rather than self defense although it does teach you a lot about control and respect and I believe the most powerful thing I took from it was confidence. I havent trained for over 15 years now but I still feel confident in most situations. I think confidence carries over into social/business situations too.
Completely. And towards girls too.