This happens because microgravity alters the functioning of the cardiovascular system, reduces blood volume, and makes it harder for blood to flow to the genitals. Estimates that the average man on Earth has about 11 erections per day do not apply under microgravity conditions. According to the explanation by Earim Chaudry, in space, the cardiovascular system is under constant stress, reports Metro. Microgravity causes bodily fluids to shift toward the upper part of the body, reduces total blood volume, and disrupts blood pressure regulation throughout the body, which has direct consequences for sexual function. An erection involves the dilation of the penile blood vessels and the filling of erectile tissue with blood to maintain firmness. Adequate blood flow plays a key role, so if pressure is reduced or circulation is impaired, achieving and maintaining an erection becomes significantly more difficult. A similar principle applies to sexual arousal in women, which depends on blood flow to the genital area in a process known as vasocongestion. Chaudry also points out that physiology is not the only problem. Reduced blood volume and disrupted cardiovascular regulation can lead to fatigue and dizziness, further affecting the decline in libido. Although sexual desire also depends on hormonal and psychological factors, the physical conditions for arousal in space become significantly less favorable. For the crew members of Artemis II, who are experiencing the vastness of space as few have seen it, sexual relations will likely be the last thing on their minds, and the absence of awkward and unexpected erections might even be considered a practical advantage. An additional challenge is the absence of natural convection in weightlessness, causing sweat to remain on the skin and create a hot, sticky layer of fluid around the body. Such an environment is uncomfortable under everyday conditions, and especially during intimate activities.