Here is an explanation of why Sensate Focus usually fails in the threatment of retarded ejaculation.
From: http://www.geocities.com/a_impotence/orgasm.html
"This treatment has also been criticized because it demands so much of the man - that he almost be made to give up his orgasm - and this from a man who may be having sexual difficulties in the first place because he resents having to give so much to his partner, whose role in the relationship may be passive and unassertive anyway. Apfelbaum makes the following comment of some men in this situation:"....his experience of sex is of a continuous demand for performance.....but he has no way to experience himself as being used. Instead, he has flashes of disgust and/or hatred for his partner."
"Another difficulty is that the rough and intensive masturbation that may be necessary to get the man to near the point of his orgasm and the insertion of his penis into her vagina are heavy demands to place on the female partner who may be resentful and frustrated about her partner's inability to ejaculate. These demands may be made worse if she knows only too well that the man is simply not aroused by her, a fact that she will sense quite readily if it is true. None of this seems like a recipe for a happy resolution of the problems..... "
My wife left me after 10 years of marriage because of my RE problems. I admit that I had a hard time getting aroused by her and I wasn't that physically attracted by her but I did try everything I could to overcome my problem including going to sex therapy. But all the therapy in the world won't help get a man aroused enough to ejaculate if he is not visually turned on by his partner. WE tried the sensate focus but I had trouble getting to the point of orgasm even when I tried masturbating with her beside me. And the pressure to perform even though I wasn't that horny was very stressful and I think just made the situation worse. I have had one relationship since my marriage ended with a much younger and sexier woman and I had no problems at all with her.
For men who's RE is being caused by not being aroused enough I say don't waste your money on therapy. If your wife won't do what it takes to make herself desireable to you then there isn't much hope and if you want a decent sex life again finding someone who does get you aroused is really the only solution.