He likely doesn't, but I did find this when I went about digging:
http://www.firstthings.com/article/2009/02/surgical-sex--35
It's a bit of a read. For my part, I found his summary thoroughly unconvincing. He describes in detail outward appearances and simple interests of SRS applicants as being significant [1], but later, when he claims that SRS isn't therapeutic, he is inexplicably vague when detailing that assessment [2].
His generalizations about transgendered people are also such that they're suspect on their face. He maintains that the SRS-seeking transgendered fall into two main categories [3][4]. From the beginning these groupings strike me as hopelessly narrow, such that even my casual research has turned up much more (frequent) variance than the model implies. I have to wonder just how large his sample size of patients was, he makes no mention of how many people were assessed. I'm put off also by the repetition of his insistence that SRS is essentially the enabling of mental illness (and that transgenderism is literally madness), especially when his presented arguments are specific and then vague without rhyme or reason.
The more I pore over this, the more inelegant and partial it becomes. McHugh comes across as a man who had the answer before he even sought the question, he isn't shy about trumpeting his view that transgenderism is a mental illness and that SRS is a destructive and futile practice. The justifications he presents here are almost insulting, he glosses over vital topics like in-depth assessment in lieu of talking up how silly the SRS-applicants look to him. Of course, one could argue that in this setting the man is less inclined to dollop on the facts and figures, but that's really no defense for this being as shallow and as slanted as it is. I'm baffled by his intent here. As a snarky, partisan feel-good story, it's excellent. As a piece of cogent argument or summary, it's an abortion.
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[1] "Those I met after surgery would tell me that the surgery and hormone treatments that had made them women had also made them happy and contented. None of these encounters were persuasive, however. The post-surgical subjects struck me as caricatures of women. They wore high heels, copious makeup, and flamboyant clothing; they spoke about how they found themselves able to give vent to their natural inclinations for peace, domesticity, and gentlenessbut their large hands, prominent Adams apples, and thick facial features were incongruous (and would become more so as they aged). Women psychiatrists whom I sent to talk with them would intuitively see through the disguise and the exaggerated postures. Gals know gals, one said to me, and thats a guy."
[2] "He found that most of the patients he tracked down some years after their surgery were contented with what they had done and that only a few regretted it. But in every other respect, they were little changed in their psychological condition. They had much the same problems with relationships, work, and emotions as before. The hope that they would emerge now from their emotional difficulties to flourish psychologically had not been fulfilled."
[3] "Most of the cases fell into one of two quite different groups. One group consisted of conflicted and guilt-ridden homosexual men who saw a sex-change as a way to resolve their conflicts over homosexuality by allowing them to behave sexually as females with men. The other group, mostly older men, consisted of heterosexual (and some bisexual) males who found intense sexual arousal in cross-dressing as females. As they had grown older, they had become eager to add more verisimilitude to their costumes and either sought or had suggested to them a surgical transformation that would include breast implants, penile amputation, and pelvic reconstruction to resemble a woman.
[4] "Further study of similar subjects in the psychiatric services of the Clark Institute in Toronto identified these men by the auto-arousal they experienced in imitating sexually seductive females. Many of them imagined that their displays might be sexually arousing to onlookers, especially to females. This idea, a form of sex in the head (D. H. Lawrence), was what provoked their first adventure in dressing up in womens undergarments and had eventually led them toward the surgical option. Because most of them found women to be the objects of their interest they identified themselves to the psychiatrists as lesbians. The name eventually coined in Toronto to describe this form of sexual misdirection was autogynephilia. Once again I concluded that to provide a surgical alteration to the body of these unfortunate people was to collaborate with a mental disorder rather than to treat it."