It's clickbait, New York Times style: "Does a More Equal Marriage Mean Less Sex?" Spurred by findings of a paper by Sabrino Kornrich, Julie Brines and Katarina Leupp published in the American Sociological Review, the article argues that, "too much similarity in egalitarian marriages leads to boredom and decreased sexual frequency". In general, "the less gender differentiation, the less sexual desire.” "On an emotional level, “kindred spirits” sounds lovely. But when it comes to sexual desire, biology seems to prefer difference."
But do these findings really stand up to serious scrutiny?