Heres a little light reading for you all....
Does Soy Protein Lower Testosterone
One can make assumptions, and in looking this up I found that the soy council has printed many articles to the contrary. But for me, I'd rather not have the boys all shrunken....just sayin
Addendum: go to forums and in the "best of " section Adonis has posted a very thourough set of threads on soy....