Astronauts have been warned not to masturbate in space.
Astronauts are not allowed to pleasure themselves in space
Self-pleasuring is banned on rockets amid fears that floating semen could impregnate females on the spaceship.
The crazy revelation emerged on Conan O'Brien's Needs A Friend podcast, where he quizzed a NASA engineer on whether he had ever sent porn to the International Space Station.
O'Brien asked: "Does porn work in zero gravity? It goes everywhere."
The boffin - named only as Smythe - replied: "Three female astronauts can be impregnated by the same man on the same session... it finds its way."
NASA is set to conduct a study into sex in space with long-haul missions and space tourism on the rise.
A team of Canadian academics had urged the space agency to embrace "sexology" in orbit and says it will benefit the human race's attempts to explore the rest of the universe.
The team from Concordia University in Montreal said: "Understanding sex and how it will work in a low gravity environment, is essential to the success of deep space missions, and building off-world settlements."
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