The "bulb" is the hooded clitoris, which EVERY LIVING MAN MUST MASTER if he is to thoroughly please his woman. There is a tenderness, a tolerable friction that a guy can place on this bulb that, once mastered, can hit the mark each and every time. "Hitting the mark" is a phrase I use for pleasuring a woman to her highest point of exhileration by physical stimulation. There are all levels of this, but nothing measures up to the peak. It's like climbing a mountain...would you stop in the middle of the mountain and say that you were successful? Would you climb 3/4 of the way and scream "Yiippeeeee!!"? No. The apex is where the successful guy strives, not anywhere else. Help her climb to the peak and win her respect and admiration. Most married guys do not know of this...such a shame.