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(1)
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Do not use or take drugs that may deaden any sensations. Injecting lydocaine or any other topical anesthetic into the shaft is dangerous and won't allow you to tell your limits (especially if your goal is to stretch out your urethra).
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(2)
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Use water-
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(3)
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Be sure everything you use is clean and if possible, sterile... this goes more of less for sounds and other items inserted only into the urethra, not the bladder. Never use an unsterilized catheter or anything unsterilized if you plan on getting into the bladder.
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(4)
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Encourage pissing after you're done, this will help to clean out residues, dirt and any other small bacteria that may have come in from the outside.
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(5)
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Even in hospital conditions infection is not uncommon. Should you get an infection, check it out immediately.
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(6)
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In any BDSM, if you don't trust the person doing it, don't do it.
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(7)
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Never flush or force any liquids into the bladder.
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(8)
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Be careful not to let go of the sound when it's inserted, once the sound is inserted more than 4 inches, the sound will usually rotate slightly and pull the rest of the sound down. Should the sound be totally inserted into the urethra and you lose grip, don't panic and relax -
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(9)
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Be aware that urethral play, no matter how carefully done, does irritate the urethra... so if you have any penetrative sex/oral sex afterwards, use a condom.
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