aw my other post was deleted for stated such sensations shouldnt be done away with so quickly, or pushed aside so fast.
OK! so no with proper and more suttle writings i will explain.
the secret of the golden flower, calles it the jade tiger.
the jade tiger, is also translated as breath energy.
when during breathing, energy, and breath, have united, and are flowing together, this spirit manifests.
the tingling you described, if it hurts when touched, it is blood circulation being cut off. if it dosnt hurt, then it is the same energy in positive form. think, one is negative oxygen, the other over oxygen.
sivinanda describes it in siddha vedam as vibrating vayu. i believe he said vayu, possible siva sakthi, havta check.
anyways, it is more or less, the vitalization of the electrical princable within the body. if you accumulate a tone of this within the body, you can then exhail and hold the breath. this will cause it to become magnetic. at least these are the feelings, or sensations percieved.
i works directly with the nervouse system, and opens it quickly.
consistancy is more needed than quickness. and the goal is not a little vibrating, but a ton of it. not infinitly increasing it, but holding it at a steady amount larg amount.
i use complete in and out breathes. as it is union of breath that is needed.
i am not a master of this technique ,though i do reccomend the book siddah vedam by sri swami sivinanda. the secret of the golden flower. i also use the full yogic breath when doing this.
and more or less preform it standing up.
I relate the energy to the same energy experianced during a sneexz,bliss,or chill, but it is most easily associated with the blood being cut off. though the opposite of it.
if you learn this skill, the muscle may contract on their own with increased. but !!!! it is always warned, do not over do it, if you begin to persperate, then stop. one should always feel refresehd afterwards, never worn out. this is activation of breath energy, chi of the heart.
apologise, the post is not in best form.
ps. the sexual organ, is an open door. stimulation of outflowing energy. dont focuse on it, but be aware. union of breath. consistancy, and rythem. their will be a point were u feel like u no longer want to breath, at this point if u stop, youll simple not breath or breath slow for a long while, go past this, and the vibrating just may start.
dont expect the vibrating every time. good luck.