I genuinely want to know how many regular cis men sit down. I suspect it is quite a few more than most people (including them) suspect, but for the most part no-one will talk about it because it's so un-masculine* (ha). At least half the men I know will only use cubicles** but, again, I reckon actually admitting that is 'unmanly'.
I often think everyone should sit. I mean, seriously, just because you can doesn't mean you should. Anyone who's seen the inside of men's bathrooms, especially where alcohol is served***, knows how well aiming ends up going. In some cases I wonder whether a woman couldn't do just as good a job, seriously. And how do men cope with no toilet paper? Shake it off, splashing the surrounds yet more? Continue their day with a damp crotch?
Where sitting is not an option (see above re: disgusting men's toilets), I still can't stand. Awkward hover-squats ensue, which I am sure would be an immensely confusing sight if the door came unlatched****. Unsure how anyone with different equipment manages it, as I know men don't have a full monopoly on terrible toilets.
* I knew a girl once who dumped a guy because he sat down to pee. Everything was fine before she knew but, once she discovered, that was apparently a bad sign.
** And in loads of men's toilets, each urinal takes up the space of a full cubicle, so why not just have one? At the very least, barriers between urinals would make plenty of men happier. Plus, unless the place is crazy busy, no-one uses urinals next to each other; it's an unwritten rule. So cubicle-only rooms are probably more space-efficient. Another mark in favour of unisex toilets.
*** And I've seen plenty of drunks for whom even the standing part is difficult.
**** I've just remembered America has those ridiculous gaps around cubicle doors. I've seen some where the doors only went up to (standing) chest-high. How the hell do people of any persuasion live with that?
In closing, to further deflect from the fact I've thought about this topic maybe a bit too much, some tales of terrible men at urinals from an old workplace of mine:
1. I walk in to see a man standing, holding his phone to his ear with one hand. Then, flow continuing, he takes a bite from the sandwich he was holding in his other hand...
2. There was a guy who, when he had the room to himself (cubicle-users excluded) would use the urinal, then walk to the sink, wash and dry his hands, and then put everything away and zip up.