Why would it be her H who has to go? His Dr. gave him pills. He's ready. She admits to lacking desire for the man.
Well, WDID indicated that H has had general difficulties with sexual desire/performance in the past, had an "uptight" upbringing, possible medical causes have been explored and she believes it's more emotional than medical. Pills can address some of it, but if there are some emotional issues that are making it difficult for him physically, I think it may be beneficial for him to consider sex therapy. It just may help him explore and work through any emotional barriers to sex in general.
As far as her own physical desire. She hasn't indicated that she has a problem with sex in general, but just with her H in particular. She doesn't need a sex therapist for that.
There is no arriving, ever. It is all a continual becoming.