Britney Spears: Balls-Burning is the latest Male Contraception Technology. However, overwarming the balls will destroy sperm producing tissue irreversibly

Heating Up Testicles With Nanoparticles Can Work as Male Contraception. Here’s How

Women have a variety of methods for contraception, but only two methods are commonly available to men: condoms and vasectomies. Both methods have their drawbacks.
Condoms can break, and some men are allergic to the latex in standard condoms. Vasectomies are surgical procedures that can be painful and difficult to reverse.
So the search for alternative male contraceptive options continues, and one method currently being investigated is nanocontraception.

Never good to see giant sperm in the fire…

An on/off switch

Nanocontraception is based on the idea that nanoparticles – here, about 100 nanometers in diameter, or roughly one-thousandth the width of a piece of paper or of a strand of human hair – can somehow be delivered to the testicles, where they can be warmed.
If you could warm up the testicles just a bit, you would have a way to turn sperm production on and off at will because the warmer they get, the less fertile they become. But it’s a delicate process because the testicles can be irreversibly destroyed if they become too warm; the tissue dies and can no longer produce sperm, even when the testicles return to their normal temperature.
Using nanotechnology to warm testicles was first studied in 2013 on mice by biologist Fei Sun and his multidisciplinary research team. His early experiments involved injecting nanoparticles directly into mouse testicles.
These nanoparticles were long nanorods (or nanocylinders) of gold atoms – imagine a tube 120 gold atoms long with a diameter of 30 gold atoms – coated with a few long polymer chains on their surface. They looked like oblong bacteria with hairs sticking out.
Infrared radiation was then used on the mice’s testicles. This caused the nanoparticles to warm from around 30 C to between 37 and 45 C. The exact temperature depended on both the concentration of nanoparticles injected and the intensity of the radiation.
The radiation caused heat lesions on the skin surrounding the mice’s testicles, so it was assumed that this procedure was painful for the animals, even though there was no reliable way to measure their pain. The researchers decided to look for other ways to inject the nanoparticles.

Iron rods

In July 2021, Sun’s team published a paper on their latest findings. The nanorods in the new method are composed of magnetic iron oxide instead of gold, and they are coated with citric acid instead of ethylene glycol – but they have the same size and shape as the earlier nanorods.
These magnetic nanoparticles were injected into mice’s veins, and then the animals were anesthetized. A magnet was then placed next to their testicles for four hours, drawing the nanoparticles there.
This procedure – injection followed by magnetic targeting – was performed daily for one to four days.
After the last day of treatment, an electric coil was wrapped around the testicles, through which a current was passed. This induced a magnetic field that heated up the nanorods and, therefore, the testicles. Similar temperature increases – from a baseline of 29 C to between 37 and 42 C – were observed through this method. The more days a mouse had been injected with nanorods, the hotter its testicles became.
Hotter testicles led to their atrophy and shrinkage, but they showed gradual recovery both 30 and 60 days after treatment as long as testicle temperatures didn’t reach 45 C. Fertility was down seven days after treatment – in some cases, fertility was completely eliminated – but it also showed gradual (though not complete) recovery after 60 days.
Although fertility was not back to normal levels, there was no noticeable difference in the litter size of females impregnated by the treated mice and no morphological defects were observed in any of the mice pups. There seemed to be no difference in the sperm that did make it through.
And Sun and his colleagues found that, unlike the gold nanorods that stayed indefinitely in mouse testicles, the iron nanorods were gradually eliminated into the liver and spleen, and later fully eliminated from the body. This reduced the risk for long-term toxicity… More Here