Lube up like crazy the next time- I second the opinion that Astroglide is best... KY just dries back out too quickly. Anyway, in the meantime I'd suggest he dab a little bit of vitamin E oil on the cut- it will protect it from rubbing against undies and it really does speed up healing a lot.

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I am certain of nothing but the holiness of the heart's affections and the truth of imagination. What the imagination seizes as beauty must be truth - whether it existed before or not.
-John Keats