Early in the COVID-19 pandemic, researchers reported a surprising trend in disease outcomes: men were more likely to require hospitalization and die from COVID-19 than women. Researchers looked to sex-linked biology to explain these disparities, hypothesizing innate sex differences in immune function, suggesting the use of estrogens or androgen-suppressants as therapy, and even pushing for sex-specific vaccine strategies. Leading bioethicists like Dr. Ezekiel Emanuel at the University of Pennsylvania recently described the sex disparity in COVID-19 outcomes as "the unsolved mystery" (...) of the... (shrink)