Often, I go au natural, but when I have the time, I always prefer to use lotion. My hand slides up and down my shaft and over my head much easier and provides a more pleasurable experience. It's more like having my cock in a pussy. I've tried saliva, aloe vera, vaseline and even ky jelly/astroglide. I've found plain old hand lotion works the best.

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"Even a man who is pure of heart
And says his prayers by night
Can become a wolf when the wolfbane blooms
And the moon is full and bright."