Not all animal species operate on a system of only males and females! Trioecy, when hermaphrodites coexist with females and males in a population, is an understudied reproductive strategy being brought into the spotlight with pink sea urchins in the Mexican Pacific. Valentina Islas-Villanueva and Francisco Benítez-Villalobos brought their research to our attention because they found that trioecy is maintained as a time-stable mating system, not as a one-time coincidence or a disorder. Their work adds to a growing body of evidence about the naturally occurring diversity of sex in living things.