The great divide between veggie/tofu-eating-women, and haunch-of-beef-eating-men cliches just got wider. Why? In the news is a study claiming that men can get low sperm counts from soy products (including tofu) – due to isoflavones. While this is not a great study, nor a large number of people, the issue has more credence than vegetarians might like because the isoflavones in soy products have been known for a long, long time to mimic estrogen. Which means there is biologic mechanism to support (and bolster) the study’s results. Bummer, dude.
So should you avoid soy products? If you’re a guy and you and your partner are having a bit of trouble conceiving, first get both of you checked. If you have a marginal sperm count, the answer is…maybe. This one study (done in patients at an infertility clinic) is a long ways from proof. But of all the things you can try (boxer shorts, possible surgery if you have a cystocoele), cutting out tofu/soy is pretty harmless. Just don’t go into a carnivorous cholesterol frenzy if you do…
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Doc Gurley is a Board-certified Internist physician and the only Harvard Medical School graduate to have been awarded a Shoney’s Ten-Step Pin for documented excellence in waitressing. 
The study showed that sperm motility and sperm morphology were not affected so soy products would probably not reduce fertility in most men.
This is another study http://www.ncbi.nlm.nih.gov/pubmed/18314116
“Frequent intake of lipophilic foods like meat products or milk may negatively affect semen quality in humans”