What can cause a numb clitoris? It is definitely not due to too much stimulation. What is going on?
A numb clitoris is very common; rest easy.
The vulva and its sub-parts were never intended to provide pleasure to you, their owner. The sole purpose of the vulva (and, again, its sub-parts) is to extract protection, provision, eternal devotion and money from men.
A numb clitoris simply affords its owner, the luxury of physical detachment (numbness) during sexual acts. Consider yourself lucky that you don't actually have to "feel" anything as you stake your claim to some man's life.
Hope this helps.