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Flash erection.

An erection lasting a few micro-seconds. This is invisible to anyone but the trained eye. It is an involuntary muscle reflex.

Not to be confused with a "stirring in the loins" - a more labored and deliberate feeling, involving a certain degree of participation from the subject.
As the hot blonde whizzed by, Larry and Val each experienced warm frections
by Kaiser7890 May 16, 2007
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