I do and I have less to lose.
Me too and me too.
Someone asked earlier “Why should I have to be the one to make sure the seat’s down?” Because it’s your ass–literally–that’s on the line.
Does anyone have a good reason that can’t be solved with the nightlight? Many women can’t remember to check the toilet before sitting. Men obviously can’t be expected to remember. A nightlight is always on, unless the light burns out, which will likely be noticed. It seems like a good way to please everyone to me.
I’ve never understood the “I stagger into the bathroom and sit my ass down, in the dark, without checking first” argument.
It’s a well known fact that at night, when the lights are off, is when all the spiders come out, and they like to hang out just under the toilet seat, lapping up condensation. If you don’t flick the light on, the spiders all stay there, waiting to crawl up your nether regions.
My husband is violently opposed to those furry lid covers because his mother had one that would unbalance the lid and send it crashing down at inopportune times.
He says that he has peed on many a lid.
Well, peed often on the same lid, anyway.
I tend to put the lid (and necessarily the seat) down for a couple reasons. First, my toilet is poorly weighted and it likes to slam shut anyway. Second, the less likely I am to see the inside of the toilet, the easier it is not to clean it. 
But I don’t see the merit of an “always leave the seat in the position that’s easiest for women” policy, unless it’s a woman’s house or you’re clinging to some notion of chivalry. Either (1) always leave the lid down to keep things from falling in, prevent toilet plume, etc., (2) always leave it the way you found it to avoid surprising other people, or (3) don’t worry about the seat, since 3/4 of the time it’ll be down when you’re finished anyway.
Let’s see.
I have both fallen in the toilet and sat on a closed lid on many an occasion. The latter isn’t a big deal, because I wait until AFTER I am seated to start peeing. I often go to the bathroom half-blind and in the dark. I know where things are. I used to have my own bathroom, and got used to it. What can I say, I have lots of stupid habits and stupid instincts. I stub my toes all the time. I forget to close cupboards and bang my head. I forget to look at the toilet and I fall in (and yes, I do plop myself down hard enough to get some water, and not just cold porcelain, on my nether regions.)
So, what’s the solution? My SO and I have never even had a discussion about it, which means I suppose he usually leaves the seat down. It’s nice of him. I appreciate his consideration, and clearly he’s happy enough to do it as I’ve never had to ask him to. If he, rather that I, was the stupid one around the house and more urgently needed the seat in his position, usually, I would do that for him too.
Train yourself to look at things before you sit on them.
Hunting dogs are trained not to chew on the animals they bring back by giving them a dead bird stuffed with pins. The dog quickly learns to carry it softly enough that he doesn’t get poked in the mouth. If you need help remembering to look at the toilet before sitting on it, perhaps your husband could leave the lid down and put a hairbrush or sea urchin on top.
Ah, but we have ALREADY derived a simpler solution, as outlined above.
Plus, retraining me would not be fun. I persist in stupidity in many areas of life.