Just added to Another Internet Soy Article:

A 2010 study found that low (1.64 mg/day) or high (61.7 mg/day) isoflavone consumption for 8 weeks did not significantly affect semen volume or sperm concentration, sperm count, total motile sperm count, or sperm motility in a sample of 32 healthy adult males (15).

62 mg is the amount of isoflavones found in about 2.5 cups of soymilk.

Thanks, Marco!

Reference

15. Beaton LK, McVeigh BL, Dillingham BL, Lampe JW, Duncan AM. Soy protein isolates of varying isoflavone content do not adversely affect semen quality in healthy young men. Fertil Steril. 2010 Oct;94(5):1717-22. Link

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