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I think you are only supposed to use them for sustaining hardness. You dont want to restrict the blood flow too long, 20 minutes or so.
I have tried one with a gadget on the top for "her pleasure", didnt care for it, but longevity has never been a problem for me.
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'Tis better to remain silent and be thought a fool, than open one's mouth and remove all doubt.
Samuel Johnson (1709 - 1784)
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