Soy Sauce isn't the issue. It's large quantity of soy ingestion. Tofu, Soy protein powder, etc, etc.
The science is still showing that soy is bad for male sex hormones. I just saw a study yesterday where soy supplementation ( > 1.2 g per kg bw ) gave no strength gains over a 12 week period, where milk protein supplementation ( > 1.2 g per kg bw )and even just average protein consumption ( < 1.2 grams per kg bw ). It did suggest over the 12 weeks there was no muscle mass loss.
However I would still avoid large quantities of soy intake.