A study published in The Journal of Sexual Medicine revealed that younger and fitter men beat out old, flabby guys when it comes to bedpost notches, but that “coital frequency was higher among men with a height of less than 175 cm.”

In regular English: dudes under 5'9" get more play.

Researchers polled 531 men aged 20-54 years about their height, weight, age, fitness level and other factors, and asked them confidentially about the number of times they had intercourse in a given week.

Coital frequency was also reportedly higher among men who weighed less than 172 lbs, had a normal body-mass index and no metabolic disease. Among men who reported a coital frequency of more than 3.5 times a week, a wider waist circumference showed borderline association with lower sexual activity.

The takeaway: Invest in a gym membership, not lifts, if you want a healthy sex life.