It's sexist!
I've met girls who have better control of throwing pee than I do.
Just sayin'
they do, they are called CROTCH LESS PANTIES
NO! Crotchless Panties are nothing more than a belt.
I reject the possibility that something that does not cover your junk can be refered to as
"Underwear" 
we require they pull them down. There is nothing hotter than seeing a gal sitting on the toilet with her panties half way down her legs!
The fly on men’s briefs is part of the stitching to accommodate the additional fabric to support the penis and scrotum. The design was introduced by Jockey in the 1930’s and has been copied by most manufacturers. For those who are not “up and over” guys, you don’t pee through the slit per se. You extend your penis through the opening and then urinate. A woman’s flush-surfaced urethral orifice would make such a design impractical.
So, live and learn.
While we're on this subject, men should take heed regarding pee etiquette around women: Never pee standing. Even if you do manage to get it all in the bowl (And let's face it, a lot of you don't for one reason or another.), the splash effect causes the edge of the bowl to get splattered, and this drives gals nuts, and not the good kind. (I do realize that there are some pee queens out there who may enjoy this, but most are not.)
So, at your own digs, sure, feel free to pee standing up. I do. But when a gal is over, and especially if you are at her digs, be seated.
And of course, be sure the seat (Both of them) are down after you're done.
Sure – it’s all fun and games till this material shows up on an exam. A bad grade goes on your permanent record, mister. Is that what you want?
There are women out there that would pull that flap aside, lift a leg and let loose like the rudest of men.
I've seen them.. I love em'.
While undoubtedly some women could put out a gnat’s eye at ten paces, the majority of us cannot exercise that level of precision.
You have proven the point.
The rearward facing trap door goes back 1910 or so (Cooper Underwear Company; Jockey International, today). A little trap door on the front could facilitate the female standing pee as well as other activities down in those regions, without having to stretch the fabric to the left or right.
(I can't find a trap door panty with an actual trap door, just Trap Door BRAND panties and thongs. If someone copies my trap door panty idea, I hope that this post ends up in evidence during the patent lawsuits.)
Speaking of the female standing pee, there are plenty of devices and conveniences available to outdoorswomen who climb mountains, ski, travel in harsh areas, etc.. When you're strapped to a nearly vertical rock face in a blizzard at 10000 feet it's nice to be able to pee like a gent. When you're hiking in a bug infested jungle, it's convenient not to have to drop trou and expose extra parts to the hungry bugs (or horny co-travelers)
I probably make as much money as you?
Go figure.
Hound, out of racial solidarity (which neither one of us owes the other) I will keep this PC. You don't make as much as me. Many here make more than me but trust…you're not one of them.
That has nothing to do with human equality however (stay with me I'm not going too high), your opinions are your own and matter…I'm sure in some star trek-ey vortex of a universe… but in this galaxy that kind of post makes my frontal lobe hurt. That's all I'm saying ninja…
Stupid post list:
Why hoes get paid son?
How providers pee?
pictures be blurred in the face dood! Why?
Does the fact that she let me stay ten minutes mean she love me?
If she cancels five times and is late tonight…is she a flake?
Anyone seen blah blah lately? She seems to be delisted?
Why do we hobby?
Do providers feel emotions?
I come and go as I please and I'm not remotely delusional in that I'm most posters cup of tea but fuck and A man…I have an IQ and like to semi flex it occasionally just to try and ground things semi back to reality.
Any takers
I've met girls who have better control of throwing pee than I do.
Just sayin'
I have never used the pee hole in underwear in my life. It's a weird design and so much easier to pull my dick up over the elastic than to try to reach in that hole sideways.
At least some of them. 
Didn't notice the two previous replies about crotchless panties.
Right question, guy! ;-D