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It's not just bacteria from the anus but rather a bruising/irritation of the urethra from the bumping and rubbing on it through the vagina. Rough sex or being rough with the dildo could cause irritation. If you are holding urine in your bladder then any germs that get into the urethra, combined with the irritation can cause your body to be more susceptible to a UTI.
If I were using clean hands only and no dildo I would not worry about it. I'm not terribly prone to UTI's and there are times when I don't pee right after. BUT I almost always do pee after I masterbate and of course after I have sex because I've gotten them enough to want to avoid it.
If you are one of those people who have never had a UTI then you are not as prone to it. If your dildo is clean I wouldn't be as anxious about having to go.
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"Always learn the rules so that you can break them properly." Dalai Lama
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