Back to the question why do girls go to the stalls in pairs:

>Because on the off-chance that the stall you choose is out of toilet paper, you can just ask one of your girlfriends to pass some over from her stall.

Thats the thing, guys just WONT understand that answer...
And I know beause I'm a guy and I immediately thought, well go to a cubicle which isn't almost out of toilet paper...

Also, on the subjet of Urinals... There are several reasons:
1) Quicker
2) Easier, I know far to many crackheads who have trouble aiming at a toilet seat
3) Quicker
4) Save on space (take up less room)
5) Quicker

No, the quicker is true. Seriously, Guys I know don't get that it takes girls longer to go to the toilet because they actually have to SIT DOWN, and unbotton their trousers and stand up again... Without the Urinals 45% of the time we save would be lost.