So you really don't know anything about how he works with couples.? Well, I wish you the best.
Back to the sex issue, was it like bad timing? The moods were never together? Or was she never interested and found excuses?
If you have not read Michele's book on the Sexually Starved Marriage, I encourage you to get it. Even if your W isn't interested in reading it, I think it might help you.
Some women really starve for romance, and need it to have a healthy sex life. Some women need the fun, flirty play before bedtime. Some need to hear WOA to get in the mood. I believe the man needs to start the love making hours before bedtime. So many men start at the wrong end of the woman's body. He needs to start with her head. Make love to her mind, first.
I think couples need to break up routine. Fight against getting in the same pattern. That is what causes boredom. I remember having a lot of fun getting dressed up in costumes (if that's what you could call it). My H would come home from work and never knew what woman (me) would be waiting. Of course, I had to tone it down when the kids were around, but I would plan for them to have a stay over at grandma's......and then I could really knock his socks off! . It didn't happen every night. And, it would have been nice if he would have ever initiated some action that showed he was planning a romantic evening for me. I always felt it was one-sided.
It's so easy to let life get in the way. When things aren't good in the bedroom, it's usually a sign something needs to be addressed. If it's not, things begin to snowball until you don't know the main problem.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!