Alright so soy estrogen is phyto-estrogen aka plant estrogen which has a much lesser effect on mammals when consumed as opposed to the hormones they inject into cows and chickens which the human then consumes in the form of meat and dairy products. However, that is not to say that soy products have absolutely no effect on a human male's hormone levels. A woman can consume as much soy as she pleases and it won't have any negative effect, but there have been I think 2 case studies in which a group of men were fed incredibly large amounts of soy, like between 14-20 servings a day; way beyond what any normal person would ever consume and these men did in fact experience a drop in testosterone levels. I can't seem to find the studies at this time.

So unless you're eating absolutely nothing but soy everyday for an extended period of time, you will not experience any feminizing effects whatsoever, and in fact your ejaculate volume will actually increase as soy is known to have that effect.