Is seduction always needed in marriage?

So I am a young 25 year old married man and I have been with my wife for a couple years (prior to marriage). Our sex life is great, when it's active. There are occasional "dry periods" where my wife is not as sexually engaged as she normally is. What is my responsibility here? Should I be working harder on sexual appeal and seduction or do I let her come to me when she is ready?

A person's sex drive fluctuates. It's not always constant for everybody. It may not be something you need to work on.