Girls talked about different ways to judge the size of a guy’s member going all the way back to junior high—and I’m sure guys had their ways, as well. We checked out the size of their hands and feet, the space between the end of their index finger to their thumb and the length of their middle fingers. Of course, in those days we had little to go on as far as real world experience, and the methods were no more than urban legend. But for some reason they stuck as we grew older. No matter how often people say it’s the motion of the ocean that counts, penile size fascinates.

Now, family physician Chris Culligan has developed an app that uses various scientific studies to predict penis size. The aptly-named Predicktor app studies personal stats that have been shown to correlate with penis size—such as height and finger length—to calculate the measure of the member. Culligan told WallStreetInsanity a variety of factors inspired the app’s creation.

“When patients came into the office with concerns they had an unusually small penis, I realized a lot of it came from misinformation on the Web,” Culligan said. “This was usually created by companies spreading lies to flame anxiety, all to drive sales of their bogus products claiming to be able to increase the size of a man’s penis (they cannot). When I reviewed the scientific literature on the topic I found lots of interesting studies that actually had real correlation.”

During his research, Culligan found many commonly held beliefs pertaining to penis size had no truth behind them, while others surprisingly did.

“The most important thing was not what was correlated, but what was not—race and shoe size for example,” Culligan told WallStreetInsanity. “It was really interesting to learn that there was evidence out there debunking some of the most commonly held beliefs on male size. From there, I decided to add to my Predictor series of apps by creating social app that will reach out to the public through humor and leave them knowing more about men’s health, thus reducing unnecessary anxiety among men and women about male size.”

So shoe size is out for a reliable measure of penile length. And even though I learned in college that Asian guys are tiny, black guys are hung, and white guys can go either way… Race apparently has nothing to do with it either.

“No study has shown definitively that race has any bearing on penis size,” Culligan said.

Some of the myths actually have a scientific basis, however, and are used in the Predicktor’s calculations. For example, finger length is actually tied to penis size—so is height. And interestingly enough… guys with bubble butts may have bigger dicks. The Predicktor Web site states, “The supposed relationship between penile length and gluteal size may have a scientific basis, but contrary to belief, large buttocks is more predictive of longer penile length than small buttocks.”

Here’s another new one… a 1999 study concluded gay dudes have, on average, longer penises by one third of an inch. Imagine that.

Right now the Predicktor app is only available for Android devices, although Culligan told WallStreetInsanity that his team is currently working with Apple to see what version of the app might work on iOS. Still, the app has been hugely successful in the Play Store, with thousands of downloads thus far.

“We feel fortunate, as we are now featured on the front page of Google Play Store presently, in the “Top New Paid” section,” Culligan said. “We are also listed as in the top medical app sales in many countries.”

Predicktor isn’t the only app Culligan has produced, either. He has also developed an Alcohol Abuse Predictor, a Depression Predictor and an Anxiety Predictor, and is currently working on others, including a Parenting Predictor, so as far as medical expertise, he’s the real thing.

[Images via Predicktor]