Sexual relationship in marriage

I'm a 28 years old woman and married for nearly 5 years. I really love my husband and I don't doubt that ever, even for a second. I have never had sex with anyone other than my husband in my entire life. I had physical intimacy and hot make out with ex boyfriends before I met my husband but not sex. I don't think I have really enjoyed sex with my husband in the last four years. We now hardly have sex. Once in a few months. There isn't much foreplay and he never goes down on me but expects me to go down on him. Every time we have sex, I go dry and have to keep using a moisturizer to keep it wet. I don't enjoy it. I have lost interest in sex because it never leaves me satisfied. And for the last few months it is making me mad. I read smut and watch porn and touch myself and it makes me really wet so I know the problem isn't me. I have been fantasizing about everyone - fictional characters to coworkers! I just need someone to take me like they do in the books. I want to feel what other women feel when they have the best sex of their lives. I am so turned on all the time and don't know what to do. Again, I know I will never cross any lines because I love my husband a lot and I have always been faithful. I cannot stand infidelity and hence, never walking that path. But my needs are not being met and it is driving me crazy because having the best sex of my life that leaves my knees weak at least once in my lifetime is all I think of.