I think it is extremely important. You're going to have to talk to her and find out what the deal is. What was her sexual drive at the beginning, did it change or has she always remained the same?If she changed, find out why? If you started dating her and she was always like this, find out if she can change. If she doesn't show interest or care to change I'm afraid it's time to move on or get hooked on porn&your hand, unless she's okay with you cheating on her?You guys really need to discuss this, maybe she's into things you don't know about and your sex is boring to her...you never know, it could be a number of reasons why, just ASK!