you're the dummy. men have estrogen in their system as well, just like women have testosterone in their system. it's a balance thing, and can really cause problems for men when out of whack. soy contains phytoestrogen compounds. but that's just the tip of the iceberg. it also has a lot of compounds that block the absorption of minerals.
the best source for information about soy is westonaprice.org
Dr. Weston Price was a nutrition pioneer who studied the diets of healthy traditional/indigenous cultures around the globe to see what they had in common that gave them low incidence of tooth decay, cancer, heart disease, diabetes, and all other modern diseases.
and i don't want to be a party pooper, but there has never been in the history of mankind a society that was vegan...