My 2 cents
As a predominantly male oriented forum, I don't think you're going to get a lot of people on here with thoughts and opinions on panty lines
Unless of course the ladies on CP would wish to contribute, I don't think this thread will satisfy your curiousity
Although, if you have a wife,gf, significant other, you'll probably learn all about their intimates and probably accompany them into a Victoria Secret of La Senza on some occassions