ok so "A Girl" goes to the bathroom then goes back to work or whatever. then when she gets home and gets undressed she notices Doo Doo stains all over her panties.
A Girl then starts crying "oh not again" she says then tosses away her ruined panties.
She doesnt know what she can do about it. after using the bathroom the panties crawl up her butt and absorb the unwiped Doo Doo so she cant tell that she didnt wipe good.
then she has a though. "Hey if I wear a G-string then dont wipe good ill get that squishy doo doo sweaty slimey fealing, since the g-string isnt big enough to absorb the Sweaty doo doo.
sure enough after using the bathroom she gets that sweaty doo doo squishy fealing and goes back to the bathroom and wipes better.
after a week or so she has trained herself and no longer has the problem of not wiping good.
so G-strings are worn because somepeople dont know how to wipe their ass properly.
/runs around in a circle flaping his arms while meowing like a cat.