Extremes - PC is nice and sensitive but it can ruin theatre. Don't be afraid of physical contact on stage. Improv is about making choices and exploring each choice you make. Start making choices early and follow each decision to its fullest, funnest potential. Don't stick to structures.
Intuition is the key to satori.
They say that people who talk incessantly of sex are impotent. This is so with improv. Talk is cheap. True characters are rarely, if ever, one dimensional. Those are caricatures.