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Odd the wiki article cites it's "scientific studies" to show up to a tablespoon to a tablespoon and a half of liquid. Then some lovers guide says up to a liter or a liter and a half.
The studies also state many women do not have the glands/opening and that is why it is limited. Yet others say everyone can be trained to do it.
So shall we believe the science or the wives tales.
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