Jack and Catherine, the "string up the butt" assumption is only true with cheap or strictly "cosmetic" thong undies. Quality undies that are built for function rather than sex appeal, don't "string up" the patoot, they fit properly.
But I understand how those who've never worn them are so aghast at the concept. I was, but I was so sick of those damned undies' either sliding down or pinching an ugly, distracting panty line, that I was willing to try anything. Serious ones are pretty boring but nicely functional. Stupid ones are frilly string-up-the-butt exhibitionist ornaments.
Okay, points well taken. ;) Thanks, Finny.
Then, I’m an exhibitionist...and like it! ;)