Wife seems to be a different person and we end up arguing...?

Before my wife and I met we both were into similar sexual activities. We both enjoyed going out and partying it up. While we were dating and early into the marriage we meshed awesomely and were enjoying ourselves. Now 6 years later she's seems to be changing, we try to talk and end up arguing. She'll tell me that it wasn't really her back then...it's aggravating because that is the person I met and fell for. I can't and won't force her to be sexually playfull if she doesn't want to but that means that I'm sacrificing what I want, and you can't really compromise on a yes or no option. Any advice?