Aaaaw cool, don't tell me it's Grip jumping on porntalk in between Army takes? Just don't bother using these complex positions in a video stick to doggy, missionary, reverse cowgirl and you can't miss. I know you now this already, but since you were asking just forget civilian chicks unless they got a bigger porn collection than you do.
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"I only insult those who deserve it." - Alfred E. Neuman