All the time? No. Like 50/50? Sure, it's kinda sexy. Really it's just something diffurent. They make those panties that split down the middle so, you open them up and go for the pussy, anal. I can't remember the name but, if I can find a pic I'll put up.
Edit: crotchless panties. I'm baka. Here are some pics. #2 pic is lased crotchless. Last pic just normal.