Here are the main tips for using all models:
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Open your pants, without pulling them down, and spread away the textiles that may bother you;
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Go out a handkerchief, which you will hold in one hand, and the portable urinal, which you will hold in the other hand;
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Slide your lingerie on the side and place the piss-standing between your legs, as close to your body;
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Toggle your pelvis back to facilitate the flow and let yourself go, avoiding shoes if possible.
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Here it is, it's over. All you have to do is throw your female urinal in a trash can, or rinse and put it away if it is a reusable model.
Also don't forget to close your pants!