Ah trish, you are too young to know the truth, but i will tell you anyway.
The G-string wasn't invented to see a chicks ass, it was to hide panty lines. Pretty boring stuff, but wait, here is the interesting stuff.
A couple years back, (dig deep you will remember) the fashion industry popularized the low cut jeans/pants movement. This was what made it possible for all the men of the world to enjoy seeing a womans intimate apparel. It mattered not what type of panties a girl chose to wear since the low cut jeans would always slide down just enough to allow us to see the promised lands. Even if a girl hiked up these low cut jeans, sitting in a classroom chair for more then 5 minutes will slide those hiked jeans down.
If the teacher is boring, then that time drops down to about 2 minutes because the girl will undoubtably lean forward and want to fall asleep. Leaning forward helps to see the panties so much that when i go to class i choose to sit behind the cutest girl that looks the most tired. LOL
The actual G-string/thong movement is still an enigma as to why it got so popular. Did women always wear them, or did they see all the teenie bopper sluts on TV wear them and hop on the band wagon. I am sure its a little of both reasons, and prolly mostly attributed to a less sinister reason that i haven't yet figured out.
Of course the underwear industry cranked out alot of butt floss a couple years ago (i.e. Victorias Secret, Fredricks etc.) and their models started wearing them. This must also have contributed in the rise of thong usage today.
Unfortunatly now the women of the world are aware of all us horny dudes trying to sneek a peek so they started wearing the baggy shirts again, and now pressured the underwear industry to come up with low riding panties to compliment the low riding jeans. This was a sad day in the lives of all men cuz now, no matter how far they lean forward, the amount of panty seen is dramatically cut down. Sometimes to the point that there is no panty seen anymore.
Luckily most girls stocked up on thongs before the new low riding type came out, so we will be able to enjoy them for at least a little while longer.
That brings up another point though, the fact that womens panties don't last but a few wash cycles before they fall apart. This is another consipracy making women continually buy panties and there by keep the underwear industry afloat. A guy can get 3 good yrs out of underwear (sometimes longer) a woman on the other hand, gets about 6 months tops.
So gentlemen look while you can, make it obvious because the opportunity is fast slipping away to view the most inimate of clothing a woman can wear.
In closing, their is a downside to all this thong business, and Manda touched on it. Chicks that should not be wearing thongs are trying badly to cash in on the craze. There should be some rules on thong usage.
RULES FOR THONG USAGE
1. You must have an ass! (not flat)
2. You must have hips! ( no boy hippers here)
3. You must not make a car drop more then 1/2 inch when you step into it!
Obese women generally need not apply, (though i have seen a select few that look good in a thong) VERY RARE THOUGH
4. You must be an adult, Sure i like young women, but damn, seeing a 12 yr old in a thong is revolting, usually they don't have hips, they have a boy ass and for some reason thongs seem to have the power to turn a 12 yr old into a slut, i don't get it, its like black magic or something. (REVOLTING)
5. Age limits! i saw some chick as least in her fifties sporting a thong the other day! I just about tossed my cookies all over it.
6. Tasteful thongs! More and more when i see a girls panties they are ratty and stained. Thongs are getting uglier and uglier every day, what possesses these women to buy a thong with floral patterns all the way around it, (even wrapping around the floss area) these look awful. And i know thongs don't last when they start to change color, or unravel and tear, THROW THEM OUT, don't say "oh they are alright for one more use" It makes you look unkempt and used.
7. The "Mormon" thong! girls that think they are good girls buy these thick cotton, solid color jockey or hanes thongs that look like they are parting the red sea when they bend over. Don't these things hurt? Don't your cheeks have a threshold for pain? Why would anyone want to spread there cheeks that far, it looks painful, and always leaves unsitely panty lines around the crack. YOU DON'T NEED TO FIT IN THAT BAD!
Anyways i have rabled enough, feel free to comment further, for the science of the thong is ever ongoing!