Re: the 60 Minutes article.
Towards the end of the article they spoke of hormones possibly playing a large role in determining gender associated behaviors in rats, the implication being that they do so in other animals as well (like, say, humans as a totally random selection...).
I think this may be a factor, but am reminded of an NPR piece from last year (possibly a This American Life???) in which NPR office staff members had their testosterone levels measured. The findings were remarkably inconsistent with the genders and sexual orientations of the folks tested. Anyone else remember this?
You can listen to that here:
http://207.70.82.73/ra/220.ram (Real Audio required)
The point of the
60 Minutes bit though, Boschi, was on
prenatal hormones, not the hormonal levels of adults (ala the TAL staff screening). Hormones undoubtedly do play a significant role, prenatally, in "mapping out" the way our brains are wired (of course, all sexuality/gender ID begins in the
brain!) . . . but I also think it's probably too simplistic to say that "prenatal hormones are destiny".
The thing that most concerns me, is that things like "prenatal hormone levels" are not
pathologized (this was especially true on a
20/20 store about a year and a half ago, wherein one identical twin was a het female, and one was FTM. The mother had had a traumatic experience while the twins were in utero, and "experts" were theorizing that one twin---guess which one?

---had absorbed all the "stress hormone" that the mother had experienced, due to the trauma. See? "Trauma = Queer!" the show seemed to say

)
GG
Which just goes to show: evidence is neutral, interpretation is LOADED! Out