http://www.tfproject.org/tfp/showthread.php?t=72080
You need to check out this poll of the ladies preferences for our underwear. It makes it pretty clear that they do not want to see us in thongs. Having said that, I had an ex that loved me in thongs. I liked the attention I got, so I wore them sometimes for her. So, if she's asking for it, do it. If she's not, stay away from it.
Just my thoughts as the resident "Underwear Polling Scientist."
