I not overly sensitive there either, so imagine my shock when that started happening, it was over a decade ago, so I wasn't all that mentally sound to begin with..... so it took me a few days to put two and two together and connect the dots. It was ****ing weird, it would twitch, then send an internal buzzing vibration down the shaft that would last a few seconds, it freaked me out, I thought I had penile cancer or an STD. But I assessed what recent changes I'd made to my diet, looked for natural explanations, and it clicked, then I went back to one cup, and it stopped the next day.