The clitoris.
The clitoris, prostate gland, or other center of sexual pleasure.
Any place that is optimal for obtaining a certain desirable effect or result.
Any of several places on a bat, racquet, etc., with which to hit a ball, resulting in the latter rebounding with some optimal desirable effect, such as minimum vibration or maximum velocity.
Any set of conditions that is optimal for obtaining a certain desirable effect or result.