I have the same problem, but it's more severe and it's all the time (I will try to put this in vague terms because too much info freaks me and other people out!) Mine's not caused from not being clean, since I take a shower every morning and use mild soap down there, and a blow dryer..

Thank you Rhapsody for the info. Glad to know I'm not alone with this!
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Only you can prevent neurotypical jerkiness!