Earlier quoted context omitted.
Not a great food for men, though.
Debunked: https://www.ncbi.nlm.nih.gov/pubmed/19524224 "Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2721724/
There was an inverse association between soy food intake and sperm concentration that remained significant after accounting for age, abstinence time, body mass index, caffeine and alcohol intake and smoking. In the multivariate-adjusted analyses, men in the highest category of soy food intake had 41 million sperm/ml less than men who did not consume soy foods.