Space tourists could be hit with a sex ban.
Scientists are fearful of what could happen to a baby conceived in orbit due to microgravity and increased radiation.
NASA says that "no humans have ever had sex in space" but a report claims "the possibility of uncontrolled human conception" in space "poses a significant risk to the emerging space tourism sector".
The space agency adds: "Our knowledge of the effects of these space environments on the early stages of human reproduction and the long-term consequence to human offspring is in its infancy."
Couples involved could sue companies running pleasure trips into space if health issues were to arise in their offspring and Professor David Cullen, of Cranfield University in Bedford, says there are "unanswered biological and legal questions" that need to be "urgently addressed".