The myth is confirmed: what science says about tight pants and fertility

There are specific conditions that the testicles must have to fulfill their normal reproductive function. One of the best known and most interesting to study is testicular temperature. It is fascinating to understand how humans regulate scrotal temperature to ensure the fertility and survival of the species.

The testes function normally only within a temperature range, differing only by 1-3°C from body temperature. Therefore, they must move away from the interior of the body.

Evolution “designed” a pouch, the scrotum, to keep the testicular tissue at a lower temperature. This is because it is not only further away from the warm interior of the abdomen but because contact with the environment cools the scrotum and, therefore, the testicular tissue. During early uterine life, the testes are inside the abdomen and, due to the high body temperature, must migrate to the scrotum to cool down.

Consequently, any factor that elevates scrotal/testicular temperature is associated with infertility. Multiple sociocultural variables can lead to temperature change in this area. Some of these are lifestyle-related; such as clothing, hot water bathing, obesity, occupational external heat exposure. Others have recently been associated with particular activities such as the use of laptops or driving cars.

andromedi risk factors for male infertility 01 tight pants and fertility

In addition, the historical decline in sperm count in the last centuries of the population has been studied. All these factors have sparked the interest of hundreds of researchers to investigate this area to corroborate the accuracy of these associations.

Patients who did not wear tight underwear had higher sperm concentration (25%), higher sperm count (17%), and lower FSH levels (14%) compared to those who wore tight underwear.

Recently, a study published in the scientific journal Human Reproduction clarifies the veracity of the relationship of one of these factors: underwear. In this research, 656 men seeking infertility treatment from 2000 to 2017 were studied. It was evidenced that patients who did not wear tight underwear had higher sperm concentration (25%), higher sperm count (17%), and lower FSH levels (14%) compared to those who wore tight underwear. These factors are parameters that indicate the integrity of testicular function concerning sperm production and maturation.

Tight pants and fertility

This study proves that wearing tight-fitting underwear can modify, to some extent, sperm production and, potentially, fertility. The process that allows the creation and maturation of normal sperm is known as spermatogenesis. FSH is a hormone that, among other functions, allows us to determine whether spermatogenesis is proceeding smoothly. Following these findings, it is hypothesized that damage to testicular tissue caused by tight underwear elevates this hormone as a compensatory mechanism.

The researchers determined that, although the decrease in sperm count is clear, the effect of tight underwear on fertility has not been fully substantiated. Despite the existence of some decrease in sperm count, it does not appear to affect fertility.

Although the analysis published in Human Reproduction found no genetic damage to spermatozoa, other articles that confirm chromosomal abnormalities (aneuploidy) after exposing testicular tissue to high temperatures. The positive effect of cooling the scrotum in patients with oligozoospermia has also been shown to improve sperm motility and morphology.

In fact, there are myths about sperm quality and fertility and men who wore Kilts, traditional Scottish skirts. It appears that they may have had better fertility, according to an anecdotal review of the literature.

It is important to maintain measures that promote sexual health. Therefore, knowing the influence of the clothes you wear is essential for fulfilling your sex life.

tight pants and fertility

Prevention is the best weapon we currently have to combat the pandemic and to avoid all the deleterious effects that this Coronavirus disease generates, so vaccination and other preventive measures continue to be of importance.


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Dr. Natalio Cruz

Natalio Cruz MD, with 25 years of medical experience, has been until 2016 Head of the Andrology Unit in the Urology Service of the Virgen del Rocío Hospital in Seville, National Coordinator of Andrology in the Spanish Association of Urology (AEU) and General Secretary in the ESSM, positions that he has narrowed to focus squarely on this exciting project of offering a high-level private medical consultation in Marbella, Seville, Madrid and Tenerife.

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