Forget about tissue engineering and chocolate sculptures. 3D printing has finally achieved its true purpose: helping scientists discover the size and shape of the perfect penis.

For the first time, a group of researchers from UCLA and the University of New Mexico have used 3D-printed phalluses to ascertain women’s penis size preferences. Previous studies on the subject have asked women to state a length in centimeters or to select “small, medium, [or] large,” as if they were ordering a side of french fries. Other experiments have presented women with 2D drawings, but what is a penis, really, without the third dimension?

The study—published today in the peer-reviewed journal PLOS One—contains good news for men: Women prefer a penis size only slightly above average, and their preferences differ slightly depending on relationship context.