Have you ever been in the midst of a
whiz, when you are suddenly over come by a tingling sensation that evokes
goose flesh on your scalp and the back of your neck? Don't worry,
you are not alone. This happens to many people, mainly men, and may be thought of as a gift from your
subtle body.
Actually, I don't know for certain what its cause is. There is probably no strictly scientific clarification of it. However, this is the one and only explanation I have come across, and it makes sense to me.
When you are peeing from a state of relaxation and release, your chakras come into alignment, and as this occurs, a certain amount of energy accumulates at the base of your spine. When this energy reaches a certain point (usually towards the end of your session), it is released and shoots, kundalini fashion, up your nervous system and out of your crown chakra, giving you a little burst of pleasure.
Considered in this way, you just had a tantric experience. Do not try to latch onto it. Remain collected and relaxed. Go with the flow and be confident in your ability to achieve enlightenment on the sly, even as you perch or stand above a toilet bowl.