Whats the deal with girls and no underwear?!

Whats the deal with girls and no underwear?

First, please spare the perverted answers, unless they are really good. My girl started off not wearing underwear with her tight (usually really short) dresses so that she would not have a visible panty line. To me, that's senseless because when wearing a dress, girls are always going somewhere where many people will be, clubs, weddings, concerts, dates,etc. which risks the possiblity of many people seeing their "goods' rather than simply a panty line. Is this logical? Or do girls not care if guys see the goods? Now, my girl rarely wears underwear when she goes in public even in short skirts. Is this normal these days, or is she an exhibitionist in the making?

I think she's definitely an exhibitionists.
They have for some time now improve on the garment known has the "underwear" so that women no longer have to worry about panty lines. There is the thong, V string, hipsters underwear (look kinda like a really short shorts) and a host of many others. So not wearing any for those reasons is really silly not to mention the high risk of infections (be careful bro).

Anyway I can imagine how awkward you must feel about wanting to talk to her about it, DON'T. Instead buy her some really fancy ones from Victoria Secret and give them to her as a gift, and if you notice she isn't wearing it just mention to her in a rather casually manner "why don't you wear the fancy (go in details) you know I REALLY like that one... so as to encourage her.

If this doesn't work, your girlfriends NASTY, dump her. For your healths sake.