other than your skull, testosterone doesn't cause bone masculization!
IT's just that women bones seal EARLIER due to estrogen.
Estrogen seals the bones' growth plate.
Other effects on bones (other than maintaining bone mass/thickness which prevents bone disease, and by that I don't mean the thinkness you measure with tape around the bone, that's growth, I mean bone density) are:
Testosterone:
Masculized Growth of the jaw
Masculized Growth of the Chin
Masculized Growth of the Forehead
Masculized Growth of the nose cartilage
and some other parts of the skull which are usually less bothering because they are usually very much overlapped with females - someone might want to correct me if I am wrong here!
Estrogen:
SEALS GROWTH
Causes Expansion of the pelvis, like furthering apart of the pubic bones, rounding of the crests.
I am still not sure of the changes in the pelvis bone later ossify into bone or not.
One thing which points to it not turning into bone is pregnant women have further pelvic expansion due to relaxin hormone.
Relaxin softens the cartilage, ligements which hold to pelvis together and cause it to expand, mostly the pubic bones go further away from each other. - If anyone has information about this, please share it and even PM me

In conclousion, avoiding testosterone won't help you to prevent bone's masculization, sorry!

Post Merge: August 03, 2009, 04:09:39 AM
I forgot to mention!!!
Avoiding testosterone/estrogen will probably cause you grow even more.
In girls, estrogen closes the bones fast as they have high levels of it and at young age.
In boys, testosterone starts later in life and does not seal the plates BUT it is being converted to estrogen via enzyme arotomise (terrible spelling I think

) which slowly closes the growth plate.
People without estrogen simply keep growing until the material which bone builds from is depleted and then the bone seals.
See giantism