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I’d recommend that you sit, just because it’s healthier for you. But you do you!
A source for this claim might help your case.
Shown in this study, men should sit due to the splashback, which will travel throughout the bathroom, and will land on your toothbrush, where bacteria will grow (tip: keep your toothbrush in a cupboard or similar).
Risk of prostate enlargement (study, which can also lead to UTIs.
For the 1st one:
So that others don’t have to go read it to find out, LUTS is Lower Urinary Tract Symptoms. Right off the bat, if you don’t have a LUTS, this doesn’t appear to apply to you. Further, it even says there was no statistical significance for those with LUTS or healthy men.
The conclusion:
For the 2nd, I didn’t get past the title:
This seems to be about female bladders. I could be wrong here but I do think we were talking about males standing to pee. The words “sitting”, “standing”, and “male” make no appearance in the study.
This is a strange topic to have such a strong opinion about to have no good proof for.