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And if I regularly sat half-naked, exposing my genitals, on my kitchen sink you’d have a point 
Whenever I use a public bathroom usually I peek into a few stalls and notice the toilet seat isn’t entirely clean and move onto the next one - so even if they’re cleaned daily, they’re used so often they’re bound to be disgusting. Even when people wipe the seat, they’re just spreading their urine around (I know urine is sterile, just don’t like rubbing my ass in it).
See, we mathematically proved you have to put the seat down : D</p>