I should have expected some version of "howardsternland.craigslist.org" sooner than later.

As I [pedantically] commented when the question ("WTF?") was raised on my own site:

Gender is determined at conception, but sexual structures are keyed to different periods during gestation (pregnancy), which can be very sensitive to hormonal conditions in the womb. Some people have even blamed this degree of sexual dimorphism and its developmental delicacy for orientation, though the two--genitals and the adult choice of where one may put them--are mostly unrelated. Because it is rather difficult and far less entertaining to visually test the depth of women's vaginas, though he discusses them constantly, I somehow doubt that will be Stern's encore feature.