well if we looked at what a tiger penis contained, perhaps there is an excess of testosterone or minerals and nutrients that would have an effect on male virility? I have heard this is true with cocks combs and waddles, that they store testosterone there and that if you eat them they will make you randy.
but then lets also look at minerals and nutrients, RogueFarmer enlightened me to the fact that the testicles of sheeps is where they store most of their selenium, so if you hack off a sheeps balls you are causing them to have potential selenium deficiencies because if their body requires it, it does not have its own resources. so in my mind that would make sheep balls an excellent source of selenium for a human who might need those minerals, and when eaten it might restore a deficiency in a mans body that will help their body to produce more testosterone, thus enhancing virility.
with brains you are eating an extremely unique concentration of fats, vitamins and minerals, to get that same concentration from other parts of the body you would have to really source some excellent and diverse fats for sure.
Having eaten a lot of sheep both intact and wethered, I can say I personally prefer the intact. Testicles are nutrient rich, and so is placenta and the female gonads. Both men and women could benefit from the proto-hormone building nutrients responsible for overall health and vitality that are concentrated in the gonads and other glands.
The dang Stupid way people raise and eat meat animals nowadays is just unforgivably wrong . Back in Paleo days skilled hunting peoples would often prefer the largest and fattest males. They would eat the organs including the brains and the gonads, bone marrow, and fatty cuts first, and leave the rest to either dry for lean times, or fed to the dogs in times of plenty.
Nowadays everyone eats castrated animals fed estrogen mimicking food based diets. There is this myth that has been going around that non castrated male animals taste gamy and can be tough. Well I can say the best Rams I have ever had, were around 3 to 5 years old, with bellies full of fat, and meat that is a deep dark red, and tender. Even the store bought grass fed is often fed hay that comes from mineral depleted soil. Then those animals are slaughtered before they even reach full physical and sexual maturity, leaving little time to accumulate the healthy fats and mineral rich tissues that come with aging naturally on rich pastures.
Another absurdity is that the best parts get sent off to be made into spam or turned into dog food , while modern day grocery store connoisseurs spend outrageous amounts of money on lean cuts of meats, that often come from nutrient poor animals, that doesn't taste very good to begin with. Sure, deli cuts of meat are full of protein , but without a variety of quality fats and the high vitamin and mineral content that one can get from the more nutrient dense tissues of the animal, muscle meat alone will not be able to provide optimal nutrition.