People find ways to be intimate in unlikely places. So as space tourism grows, it’s likely the first sex in space will happen. But scientists warn space tourism companies haven’t adequately prepared for the consequences of humans living—even briefly—beyond Earth’s atmosphere. That gap centers on the 100-kilometer boundary between Earth and outer space.
Space tourism is no longer a fantasy
Talk of space travel used to be about the distant future. But suborbital space tourism—short flights with a few minutes of weightlessness—already exists. Prices range from giveaway tickets to millions of dollars.
Longer trips are on the horizon. Companies like Elon Musk’s SpaceX have built a lot of spacecraft experience and are moving faster than the public sector. SpaceX’s larger, more powerful Starship will likely be flying regularly in the coming years.
Flights have already been booked and passenger lists compiled for private missions that will loop around the Moon. Starship could hold dozens of travelers in a large cabin, or even private suites.
So space travel is no longer limited to professional astronauts. Given tourists’ varied motivations and how spacecraft are evolving, experts predict sex in space could happen within the next ten years.
Sex and pregnancy in space
Researchers are less worried about the possibility of intimacy in space than about whether those encounters could lead to human conception there.
Early orbital tourist flights are expected to last days to weeks, so only the earliest stages of reproduction might happen in space.
Passengers known to be pregnant won’t be allowed to fly. But the industry doesn’t seem to account for hidden or unrecognized pregnancies—sometimes women don’t realize they’re pregnant until they go into labor.
Decades of human spaceflight show that microgravity and increased ionizing radiation change the body. But scientists still don’t know how those conditions affect reproductive physiology.
Possible pregnancy issues in zero gravity
Astronauts routinely suffer muscle and bone loss because their bodies no longer fight Earth’s gravity. On Earth, gravity helps distribute body fluids like blood; without it, fluid shifts can increase pressure inside the skull, leading to blurred vision and even structural changes in the brain.
Limited experiments on mouse embryos—including ones in a mini-incubator on a satellite—have shown altered embryo viability after space exposure. We know almost nothing about effects on human reproduction, but experts expect consequences.
That raises an unknown risk of developmental anomalies in embryos conceived in space. Microgravity may also increase the risk of ectopic pregnancy, where the embryo implants outside the uterus, often in a fallopian tube.
Even with contraceptives, there’s no guarantee they’ll work the same way off Earth—no studies have tested how space conditions affect contraception.
Space tourism needs clear protections for both passengers and operators
The industry faces litigation, reputational damage, and financial losses if passengers become pregnant during flights, plus thorny ethical and reproductive-rights issues. A new study found little evidence that the sector is taking steps to mitigate those risks.
There’s also a darker risk: sexual assault in space. That’s why the industry and other stakeholders need to come together urgently to address these issues and craft protections for everyone involved.
In ScienceAlert, Professor David Cullen suggests one straightforward step: require preflight consultations for all tourists about the risks of conception in space. Operators could also consider legal waivers to limit liability if conception occurs. The space travel industry needs to be prepared for these potential consequences.
