[Lotus]

Horny Goat Weed (likewise one of the members of the Epimidiumfamily) has on male libido are likely partly a result of the increased aromatase activity, as well. If it works for you, your estrogen levels are probably pretty low to begin with (this reasoning is based on the profound beneficial effects of estrogen on male libido in men expressing little to no aromatase enzyme; Carani. 1999).
http://suppversity.blogspot.de/2012/12/natural-sildenafil-testosterone.html




Horny Goat Weed (Epimedium)
Horny goat weed is an herb that has been a traditional remedy in China for centuries. It’s used for low libido, erectile dysfunction, fatigue, pain, and other conditions.

Why do people take horny goat weed?

Some men take horny goat weed in the belief that it’s a natural alternative to drugs for erectile dysfunction (ED). Although still preliminary, there’s new evidence to support the idea. A 2008 lab study found that a compound in the herb blocks the effects of an enzyme that restricts blood flow to the penis. Epimedium, the suspected active component of horny goat weed, appears to act as a phosphodiesterase inhibitor, similar to some drugs used for ED. What’s more, the study indicated that horny goat weed could theoretically work better -- and cause fewer side effects -- than current drugs for erectile dysfunction.
http://www.webmd.com/vitamins-and-supplements/lifestyle-guide-11/horny-goat-weed-epimedium