Randy, in order to help you with your question, I think we need to know more about you. Are you a serious bodybuilder trying to get in contest shape, or are you a "regular" fitness enthusiast just like the majority here in this forum, myself included?
Concerning the reasons for your involvement with inner thighs, you say that you want more mass in that area. I can imagine that for a competing bodybuilder that might be an important issue. But, just to make absolutely sure, and since you posted your query in the beginner's section, let me ask one question: Could it be that you're rather concerned with spot reduction and you feel that you lack "tone"? If so, you should definitely include dieting in your program. As with ab routines, diet might even prove more important than exercise in order to produce visual results.
Should I have misconstrued your motivation, and you're really just after mass and power, then all wide-stance lower body compound movements will do the job, just like the others suggested.