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1.
Wet Ben: When one place's a single finger in ones mouth, before inserting into companion's sphincter.

Reverse Wet Ben: When one place's a single finger into companion's sphinter, before placing said finger into one's mouth.
Last night I gave your mum a wet ben.

That wet ben was well moist.

That reverse wet ben tasted nutty, I hope you haven't been eating nuts I'm allergic.
by Crystal Methton June 14, 2009