This is the main sexual point of all women, can you resist? Pump up your clitoris and see what develops sexually for you. The clitoris is an erectile organ and when you get aroused, it becomes erect. So women experience enhanced orgasms when they vacuum pump their clitoris. It could be attributed that you are saturating the small erectile organ with blood, boosting sensation or it can simply be the sheer anticipation and excitement of seeing your clitoris pumped up.