How to Prevent Sex on Mars: His and Hers Spaceships? Study: Astronauts of the opposite sex are bound to have some By John Johnson, Newser Staff Posted Dec 16, 2010 11:37 AM CST 20 comments Comments Romance awaits. (AP Photo/NASA/JPL, File) (Newser) – Boy, send a male and female astronaut to Mars, and next thing you know they'll be hiding behind the land rover fornicating like rabbits. It's just what humans do, says a new study in the Journal of Cosmology. It examines the potentially dangerous medical and social repercussions of sex between astronauts, pregnancy, and "the first baby to be born on the Red Planet." If NASA wants to avoid all this, especially on the long trip to get there, "recommendations include the possibility that male and female astronauts on a mission to Mars should fly in separate space craft." Tidbits from the study: "Stress levels would rise, as would irritability, resulting in considerable hostility and anger directed toward the mother and father unless, perhaps, she had sex with multiple astronauts and the identity of the father was unknown." "Performance of the sex act during a journey to Mars may require potentially complex sexual gymnastics."