The e-how link looks legit. The first link indicates that an intake of potassium can increase female testosterone.
This is interesting:
found at http://en.wikipedia.org/wiki/Phytoestrogens
The use of phytoestrogens (as soy protein) in fast food meals and other processed foods as a low-cost substitute for meat products may lead to excessive consumption of isoflavonoids by fast food eaters. A research team at the Queen's University in Belfast, in a review article, speculate that such intake may lead to a slight decrease in male fertility, including a decrease in reproductive capability if isoflavones are taken in excess during childhood.
In theory, exposure to high levels of phytoestrogens in males could alter their hypothalamic-pituitary-gonadal axis. However, studies have shown that such a hormonal effect is minor. Isoflavones supplementation has no effect on sperm concentration, count or motility, and show no changes in testicular or ejaculate volume."
Looks like phytoestrogens don't have an effect on sperm. Found something else interesting:
Working as estrogen mimics, phytoestrogens may either have the same effects as estrogen or block estrogen's effects. Which effect the phytoestrogen produces can depend on the dose of the phytoestrogen. The phytoestrogen can act like estrogen at low doses but block estrogen at high doses. Estrogen activates a family of proteins called estrogen receptors. Recent studies have shown that phytoestrogens interact more with some members of the estrogen receptor family, but more information is needed about how these receptors work, especially in breast cancer. Finally, phytoestrogens acting as estrogen mimics may affect the production and/or the breakdown of estrogen by the body, as well as the levels of estrogen carried in the bloodstream.
So if a man has high doses of phytoestrogen, it can block estrogen. Hmmmm.....so if a man is going to have phytoestrogens, he needs to eat a lot to sway boy? I think I understand now. I think I just confirmed something in-gender already told me.