How Microgravity Affects Male Sexual Function in Space

Thu, 09 Apr 2026 04:05:00 +0200

Astronauts on space missions, such as NASA's Artemis II crew, face unique physiological challenges, including those affecting sexual function. Research shows that men are unlikely to experience erections in space due to the effects of microgravity on the cardiovascular system. Fluid shifts toward the upper body reduce overall blood volume and disrupt blood pressure regulation, which is essential for sustaining an erection. This mechanical issue, combined with fatigue and light-headedness caused by cardiovascular dysregulation, also reduces libido. Women in space experience similar physiological limitations due to impaired genital blood flow. Beyond the biological factors, other practical issues such as the absence of gravity, which would make physical contact awkward due to Newton’s third law, and trapped sweat creating uncomfortable conditions, make sexual activity extremely challenging. Although studies in 'space sexology' exist, there are no confirmed instances of sexual activity oc