I don't know if it's normal, but I do something which is what I think you are talking about as well; It's anywhere from a second or two up to even 5 seconds or more. I think mine happen before the 'draining' or after when I am doing the "post-shake" It's almost a relief thing, only like a spasm of relief...very strange, but feels nice, like a whole body thing.
Twitching when i pee
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I don't know if it's normal, but I do something which is what I think you are talking about as well; It's anywhere from a second or two up to even 5 seconds or more. I think mine happen before the 'draining' or after when I am doing the "post-shake" It's almost a relief thing, only like a spasm of relief...very strange, but feels nice, like a whole body thing.