Vashti... oh vashti...
I actually have quite a superb logic about this. 100% of the time a girl goes to the bathroom she sit's down. In contrast to 50% of the time a guy goes to the bathroom he sits. So, it's less work for the girl to pull the seat down on her way down, than it is for us tall men to reach down and pull it up, piss, then put it back down. And reason number two is because we're lazy and we're not the ones who complain about leaving the seat up
We have been pissing in a toilet for many many years. We NEVER "miss." Usually it's stuck together, or there is an incorrect amount of pressure and it sprays instead of being a nice clean spout.
You have to be swift, and nimble. It takes brain power and secretive stealth.