Size does matter when it comes to salary — but not in the way you might think. A survey by online bazaar OnlyBuy found that the biggest earners tend to have the smallest willies.

To determine whether penis proportions correspond to paycheck size, the e-commerce site recruited 997 men to answer questions about work, salary and the dimensions of their manhood, the Sun reported. What better way to celebrate International Men’s Day, right?

The saucy study found that men with units measuring 7 and 8 inches earned an average of about $35,700 and $50,300 per year.

Meanwhile, men packing 3-inch penises — the threshold for a micropenis — made an annual income of about $76,780 on average. Not only that, but males with 4-inch penises were far more likely to get promoted, per the survey.

However, the well-endowed shouldn’t fret too much, as a July study by dating site Big One found that 8 inches was the optimal size for making a woman climax. So at least there’s that.

Coincidentally, OnlyBuy found that those working in the arts had the highest number of 8-inch penises, while bankers boasted the most micropenises on average.

Perhaps this is what Martin Sheen meant about not measuring “a man’s success by the size of his wallet.”

Coming in second overall for penis size were manual laborers, who sported the highest proportion of 6- and 7-inch penises. Meanwhile, medical professionals rounded out the middle with the greatest percentage of average-size schlongs.