According to NBC’s The Doctors, your ideal shade of nude lipstick is the same colour as your nipples. There isn’t any empirical evidence or peer-reviewed research to back this theory up but your tit toppers are naturally one or two shades darker than our natural skin tone.
Really, the only way to find out is by testing the theory yourself – preferably in the privacy of your own home rather than in the middle of Sephora.
And if you’re not a fan of what biology suggests for your lippie shade, don’t worry. Nipples naturally change colour over time due to shifts in hormones.