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1.
While having sex, insert a dildo into your lady's vagina. Insert your penis, pushing the dildo inward causing involuntary muscle twitches and loss of limb control.

WARNING: Do not call doctor, in most countries this action is illegal and will contact the authorities.
I gave this chick a "Thailand Twitcher" last night and everything was going great...but then it backfired and now i cant stop sokdoksdk twitching!
by Sac War Man August 11, 2010