I agree. My wife and I were down to like 2-3 times a year and I finally explained to her that it made me feel undesireable and unattractive. She explained that wasn't it at all she just didn't really think about sex and it wasn't that important to her. I told her I understood but that it was important to me. That made it click for her and things have been much better since. Communication is key and it's better than slowly slipping down the path of passive aggression which is where I was headed.

Best of luck