There's a similar thread to this in another forum (Weight Loss Support Forum?); and I posted in there that I am so glad that my legs don't rub together anymore. So, here's a TIP for all of you that have this problem: I really believe the reason is that I do "thigh presses" a few times a week. I learned to do these in a gym many, many years ago.
THIGH PRESSES ~ since I don't have the machine like at the gym, I created my own -- just lay on your back on your bed, bend your knees, and squeeze your thighs together. OK, I know this sounds weird/naughty ladies, but you know what I mean: open and close your legs ...

I started at 10 and worked my way up to 25 or more, as you want.
My dream desire is to see my "tummy" gone ... can't wait!