Gentlemen! Have a seat!
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Oh yeah, it's so gross. I'm jealous of the ability to do so, but only when camping or similar situations. There's no need to subject housemates (I'm including family members there) to your urine splatter. Outside or somewhere that I don't have to clean - go for it! Otherwise, yep, take a seat. Plus that is only taking good aim and stream into consideration, nevermind poor aim and sprinkler streams that didn't even make it to the toilet bowl.
Edit: I'll embarrassingly admit I didn't know men do sit to pee until I lived with one. Like, I guess I knew that boys are taught sitting down, and then I just guessed that as teens/adults you stand to pee all the time (because society dictates) and then immediately turn to sit if number 2 is in order. It was as eye-opening as learning that some people stand up to wipe their rears.