wrote in message
...
Up untill about three weeks from the start of inception in the womb,all
males are females in the womb.That is why us males have tits.
cuhulin

A scientist (genetecist, IIRC) that I once knew (via a lot of Usenet
activity) once had this to say about that:

quote

All human embryoes start out as female. This is undisputed fact. We
were ALL female once!

"Sorry. This is wrong. We were all sexually *indifferent* once,
having both the precursors to the Mullerian (female) and Wolfian
(male) ductwork. In the absence of a specific functioning
testis-determining gene on the Y, the indifferent gonad differentiates
as an ovary (in the presence of this gene product, it differentiates
into a testis). The testis-determination is histologically observable
by week 8. At this point, the fate of the reproductive tract is
determined by two hormones that the testis produces that the ovary
doesn't (testosterone and anti-Mullerian duct factor). Testosterone
is responsible for most of the changes in the external genitalia
(initially also sexually indifferent) that we call male. The
differentiation of the gonad into an ovary causes the Wolfian system
to degenerate (because it does not receive male-specific signals) and
the Mullerian differentiates into the uterus and upper vagina. In the
presence of testosterone, the Wolfian duct (which is the collecting
duct of the old mesonephric kidney) becomes the vas deferens. As
evidence, there are individuals with a genetic androgen insensitivity
(they lack receptor proteins that bind androgens). They are XY, have
testes (because they produce the testis-determining factor), lack
uteri and the upper vagina (because they produce anti-Mullerian duct
factor), but do not have Wolfian ducts and have completely female
external genitalia (because, although they produce testosterone, no
cells respond to it). Testosterone and estrogen do have effects on
brain development, but the effects in mammals are not generally as
dramatic as the effects on external genitalia and are more like the
effects of sex on height in humans (in other species, the differences
one way or the other are more dramatic): human females are smaller
than human males on average, but there is considerable overlap."

end quote

But I still gotta wonder about the tits.