According to a 2019 study published in the Proceedings of the Royal Society B, females are more attracted to males with smaller testicles. Even though the study was conducted on primates, it may also apply to men, given that primates are closely related to humans.

So, what's behind this discovery?

Nothing Is Ever Perfect

This view seems to be supported by the natural world. According to IFLScience, in order to be more physically attractive, male species have smaller testicles and less remarkable manhoods.

This trade-off has a biological advantage since you first see someone's appearance before you know what's in their jeans.

The Male Animals That Attract Potential Mates The Most, Aesthetically, Have Distinguishing Features

Orangutans, for example, stand out due to the flanges on their faces. To relate it to humans, consider how many straight women find bearded guys to be more "manly" and rugged.

In this context, it starts to make a lot more sense.

The Study Examined These Appealing Physical Characteristics As Well As The Size Of The Primates' Testicles

The researchers examined 103 distinct species. It turned out that those who were the most "ornamental," or traditionally attractive, tended to have the smallest balls.

What Does That Signify, Then?

According to scientists, if a man is physically attractive, he does not need to "compete" as much for women, which means he does not need to be highly virile.

The less attractive individuals must contribute something in the form of sperm production. Therefore, resulting in larger balls.

It's A Remarkable Discovery, To Put It Mildly

In conclusion, Stefan Lupold, the study author from the University of Zurich stated that "ornament elaboration comes at the expense of testicle size and sperm production. In a nutshell, the showiest males have the smallest testes."