Hands, fingers, and penis length. They’re all related according to a recent South Korean study published in the Asian Journal of Andrology.

Who knew?

While the study and its results sound more like a bad joke you might hear in a locker room, I’m not joking. The results of a South Korean indicated that “Men whose index fingers are shorter than their ring fingers may have longer penises.”

The original study was devised to understand the relationship between adult penile lengths and prenatal testosterone levels; the theory is that the higher the prenatal testosterone levels, the longer the adult penis.

Again, I’m not joking.

The finger length and penis length correlation is apparently related to the “digit ratio.”

Not sure what “digit ratio” is? You’re not alone.

According to Reuters, “The so-called "digit ratio" in this study refers to the length of the index finger divided by the length of the ring finger. The lower the ratio, the study suggests, the longer the penis may be.”

The researchers thought that testing the “digit ratio” might aid them in researching their theory about the correlation between adult penile lengths and prenatal testosterone levels, but I’m not exactly sure how the two ideas are connected. The study included 144 men who were scheduled to have urological surgery; once the men were under the anesthesia, the researchers actually measured the men’s finger lengths and the length of their erect penises. Again, I’m unsure why the researchers waited until the participants were out for the count and hope that all of the men who participated in the study actually knew what was going on at the time it happened.

The South Korean researchers are not the first to test “digit ratios” and relate them to a controversial finding. ABC News claims that researchers who conducted a totally different “digit ratio” study in 2000. The controversial results of the 2000 study concluded that women with similar “digit spans” to men’s—women’s index and ring fingers tend to be around the same length—were more likely to be lesbians than those who had fingers of similar lengths. The same study did not find any correlation at all between digit span and homosexuality in men.

As MSNBC reports, other studies on “digit ratio” have found that the relative length of the index and ring fingers may affect “ sperm count, likelihood of heart attack, hand preference, facial masculinity and more’” in men.