To those who shave and complain of irritation, you are not supposed to shave "against the grain." you are supposed to shave in the direction of hair growth (ie so your pubic hairs grow "down," then you shave down). This will prevent the bumps and most of the irritation. You won't have as close of a shave, but I find it preferable to the itchy bumps!
Additionally, using a shaving cream for sensitive skin is better...Even better if it has no added fragrances, and make sure to let your pubic hairs soften up in warm water for a few minutes first. So try shaving at the end of your shower or bath. Use a fresh razor each time. Pat the area dry, do not rub, and make sure it is completely dry before dressing - preferably in cotton underwear, and looser fitting pants - tight pants restrict air flow, causing moisture to form and bacteria to build up...Very bad for a freshly shaved area!