I'm trying to figure out how that changes the situation...

haha same here

It changes it quite a bit...if THAT'S what she meant, she could wear them once a week or once a month or heck, once a year, but just happen to have sex every time she does. There would be absolutely nothing weird or gross about that. I'm not entirely certain how plausible that is, though, because I'd think if she'd meant that, she would have corrected herself.

It says that they have been doing it six days in a row. YOU FAIL!

I thought the gf meant the same type of knickers like thongs or boy shorts or maybe even the brand (La Perla, Victoria's Secret, etc.). I still can't quite believe that someone would wear the exact same pair for six days in a row, especially after sex.

No, 96, YOU "fail." It says they have been having sex for 6 days, yes. But if what the girlfriend had meant to say was that everytime she wears those panties, they have sex, it doesn't mean she was wearing them for 6 days. It just means that everytime she wears them, they have sex.

i doubt that

those must be some pretty crusty panties then