Since I hate my inner thighs... I don't know many women who don't. I went to Jillian Michaels to get tips on inner thigh work outs and she recommends this:
Sadly, this is where your body chooses to deposit its fat. Genetically speaking, your body is predisposed to carry weight there, so that will be the last place it's going to come off. The best thing you can do is watch what you eat and keep training. This will help you lose weight in general — and eventually those problem areas are gonna have to give!
That said, if strengthening the muscles in this area is the goal, I prefer old-school Jane Fonda leg lifts. They target the muscle you want to hit without creating bulk. I know this isn't exactly the answer you're looking for, but it's the truth, and if you stay the course, your inner thighs WILL tighten up. Just keep doing what you're doing!
I'm ok with this answer.. I am able to do leg lifts! Many of the exercises and tips they recommend are hard for me because I have bad knees and can't put lots of weight on them... and when you're my size.. that is a LOT of weight!