I can almost GUARANTEE that this is the case. It is very much so for my H. I am a near WAW and we are in MC right now, discussing all of our marital issues....this is by far what my H considers his biggest "failure" and area of concern and insecurity.
My H's libido, in my observation, has always been low. We have been married for 20 years. Even as a younger man with a pretty, young "trophy" bride, he was happy with a ML frequency of 2X/month...I was devastated!! But I just bit my lip for years, assuming that he didn't love me very much or that I wasn't as attractive to him as his porn magazines--HA!
You HAVE to get him talking about this to address it. Our MC is NOT a sex therapist--I tried, and couldn't find anyone in our area that took any insurance at all, let alone mine--but this guy is working on our WHOLE dysfunctional couple dynamic. Of course, this subject is at the top of the list.
Will your H go to counseling? You've GOT to do it!!