Excerpt from
popularmechanics.com 

Both men and women have the right stuff to succeed as astronauts—that much is for sure. But an exhaustive NASA study has found physiological differences in how space affects each gender, with some cases benefitting women over men and some cases vice versa.

For instance, women are less vulnerable to the effects of interstellar radiation, but more vulnerable to space sickness or urinary tract infections in space. Men have fewer problems with orthostatic intolerance (problems standing up after extended exposures to microgravity), but develop more vision problems and kidney stones.