Mostly culture and habit, but I argue against the prevailing wisdom and say it's also more hygienic to use TP. Moving water throws invisible droplets everywhere

Mostly culture and habit, but I argue against the prevailing wisdom and say it's also more hygienic to use TP. Moving water throws invisible droplets everywhere that can spread bacteria, which is why modern health authorities strongly recommend against washing raw poultry, for instance. For females at least, there's some evidence of bidets not being ideal; https://www.ncbi.nlm.nih.gov/pubmed/21058441 https://www.ncbi.nlm.nih.gov/pubmed/21058441 Of course, soap and water should outperform TP, and maybe we should all be using soap.