There was a study done where 14 men put a polyester sling (similar to underwear) around their balls for 139 days. The goal was to test polyester as a male birth control tool.

The polyester slings prevented all 14 men from producing sperm and caused changes to their semen quality. These effects were reversed after they stopped wearing the slings. The sling works by creating an electric field and disrupting scrotal heat.

These men had no sperm count, so their testosterone levels were clinically low. The problem is that most men currently wear polyester underwear, have polyester bed sheets, and wear polyester clothes.

Some scientists studied the effect of different kinds of underwear on sperm-making in dogs. The researchers used canine dogs as the subjects.

Researchers gave some dogs cotton underpants and others polyester underpants. The scientists also left a control group with no clothing. The scientists checked the dogs' sperm, hormones, and testicles for two years while wearing underwear.

They concluded that the dogs wearing polyester blends had decreasing sperm counts, and the sperm didn't move either. But after they stopped wearing the polyester underwear, the dogs' sexual activity returned to normal.

Scientists are still determining exactly why this happened. Still, it might be related to the electrostatic charge generated or the testicular temperature.

Although this study was on dogs, scientists presume that this also affects the human reproduction system.

At first, I was doubtful that replacing my polyester underwear would increase my testosterone. I still had low energy and motivation despite trying many ways to increase my testosterone. For example, I tried supplements, diets, workouts, improving sleep, etc.

I blamed my low testosterone on genetics. I thought I had already done everything you need for high testosterone, so I was confused about why I didn't have it. After reading the studies above, I bought cotton underwear and bedsheets.

I didn't think it would work, but I was desperate for an easy fix. What's crazy is I immediately noticed a MASSIVE INCREASE IN TESTOSTERONE! It was great; out of nowhere, I got incredible energy, motivation, sex drive, and gains.

So, I believe this is the easiest testosterone boost you can get. No supplement will change your testosterone levels like this (other than steroids).

The scope of this is still generally a pretty undiscovered topic. We can safely say that polyester underwear will lower your testosterone levels. Still, it is unclear if other types of polyester material, such as bed sheets and clothes, can lower testosterone levels.

There has been no direct study on the effects of testosterone when sleeping in polyester bed sheets. Still, experts are saying that being in contact with polyester material (including bedsheets) may lower testosterone due to the polyester's highly estrogenic properties.

The best solution would be getting cotton blend or wool blend underwear, bedsheets, AND clothes. As long as the material you use is natural fibers, then your testosterone should be fine.

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