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He's smart, he's funny and both of you had so much chemistry on your second date. But even though you've heard time after time the popular cliché "it's not the size, but how you use it," you can't help but wonder how big he is... down there.

Now, there's an app for that. The new "medical prediction" app aims to help you accurately predict the size of a man's penis, using a formula that factors in information like height and finger length.

The "Predicktor" developed by a Canadian physician Dr. Chris Culligan from Toronto, predicts the size of a man's erect penis size by cross referencing trends from scientific studies with his personal stats like height, sexual orientation and finger length, according to the new app's website.

"The app shares scientific journal articles reporting on men's health and sexuality. This includes the actual distribution of penis size, as found in peer review journals. It also touches on selected literature studying what women really think about men's genitalia - not the locker room giggles but actual results from surveys," the website reads.

The new Predicktor app also comes with a collection of educational features like informational literatures and the ability to compare penis sizes of different men from different countries around the world.

While Culligan notes that the app isn't 100 percent accurate, he hopes that it will provide men with a tool to see the ranges of sizes out there and to pacify any "penis-related insecurity, anxiety of dissatisfaction" men tend to have about themselves, according to the website for the app.

"It's not how long your pencil is, but how you write your name," Culligan told science blog Raw Story.

You may still be wondering how sexual orientation factors into a man's penis size. According to Culligan, while a man's race "has never been shown to be related to penis size in any reasonable published study," he says that scientific studies have shown that on average gay men have longer, thicker penises than heterosexual men.

For those who are interested, the Predicktor app is currently only available for Android-operated phones and costs $3 a pop.