Well, just a snippet from each site visited as a sample for discussion.

The conditions governing sex in

space (intercourse, conception, and procreation while weightless) have become a necessary study due to plans for long-duration space missions, as well as the future potential accommodation of sexual partners aboard the International Space Station (ISS). Issues explored include disrupted circadian rhythms, radiation, isolation, stress, and the physical acts of intercourse in zero or minimal gravity.^[1][2][3]

Sex in space is a part of space sexology.

A graphic explanation of the possibilities

Human sexual activity in the weightlessness of outer space presents difficulties due to Newton’s third law. According to the law, if the couple remain attached, their movements will counter each other. Consequently, their actions will not change their velocity unless they are affected by another, unattached, object. Some difficulty could occur due to drifting into other objects. If the couple have a combined velocity relative to other objects, collisions could occur. The discussion of sex in space has also raised the issue of conception and pregnancy in space.^[4][5][6][7]

As of 2009, with NASA planning lunar outposts and possibly long-duration missions, the topic has taken a respectable place in life sciences. Despite this, some researchers have argued that national and private space agencies have yet to develop any concrete research and plans to address human sexuality in space.^[8][9] Dubé and colleagues (2021) proposed that NASA should embrace the discipline of space sexology by integrating sex research into their Human Research Program.^[9] Santaguida and colleagues (2022) have further argued that space agencies and private companies should invest in this discipline to address the potential for sexual harassment and assault in space contexts.^[10]

Numerous physiological changes have been noted during spaceflight, many of which may affect sex and procreation, notably circulation and the flow of blood within the body. Such potential effects would likely be caused by a culmination of factors, including gravitational changes, planetary and space radiation, noise, vibration, social isolation, disrupted circadian rhythms, or mental and physical stress.^[11]

Gravity and microgravity

The primary issue to be considered in off-Earth reproduction is the lack of gravitational acceleration. Life on Earth, and thus the reproductive and ontogenetic processes of all life, evolved under the constant influence of the Earth’s 1g gravitational field. It is important to study how the space environment impacts critical phases of mammalian reproduction and development, as well as the events surrounding fertilization, embryogenesis, pregnancy, birth, postnatal maturation, and parental care.^[12]

Studies conducted on rats revealed that, although the fetus developed properly once exposed to normal gravity, rats raised in microgravity lacked the ability to right themselves.^[13] Another study examined mouse embryo fertilization in microgravity. Although this resulted in healthy mice, once implanted at normal gravity, the fertilization rate was lower for the embryos fertilized in microgravity.^[14] As of 2006, no mice or rats had developed while in microgravity throughout the entire life cycle.^[15]

In 2006, American novelist Vanna Bonta invented the 2suit, a garment designed to facilitate sex in weightless environments such as outer space, or on planets with low gravity.^[5][16] The 2suit was made of a lightweight fabric, with a Velcro-lined exterior, which would enable two people to securely embrace.^[17] However, Bonta stressed that the 2suit was versatile, and was not intended for the sole purpose of sex.^[18] Functionality testing was conducted in 2008 by Bonta aboard G-Force One, a low gravity simulator. It took eight attempts for the two test participants (Bonta and her husband) to successfully embrace one another.^[19] According to science author Mark Thompson, the 2suit was cumbersome but moderately successful, and it is not clear whether it will have practical value for future space travellers.^[20] The 2suit has been covered in the TV series The Universe, as well as a 2008 History Channel television documentary.^[21][22] It has also been discussed by online writers.^[23][24]

Astronauts Have Just Taken a Big Step Towards Sex in Space

Katherine Fidler Published on October 30, 2023, at 11:21 a.m. Updated on October 30, 2023, at 3:15 p.m.

Sex in space has been an issue for decades, but an experiment on the International Space Station could soon pave the way for astronauts to join the 100-Mile-High Club.

The problem is not, as one might expect, mechanical, although since no one has tried to make love to space, we do not know very well how it might work.

The main concern with loving couples in orbit is the conception of a child and the effects that microgravity and radiation could have on the mother or the baby.

However, an innovative experiment on the International Space Station has demonstrated the normal development of mouse embryos while in orbit, suggesting that human embryos may also develop under the same conditions.

Sex in Space: How Do You Do It?
The honest answer is… Nobody knows.

As far as NASA, ESA, Roscosmos, and other space agencies are concerned, the official line is that no one has ever done it in space.

Unfortunately, for one journalist, a hoax about space sex once made headlines.

In 2000, respected science writer Pierre Kohler fell for a story claiming that both NASA and Roscosmos had conducted separate experiments during which two astronauts had a bit of space sex, finding only four positions achievable “without mechanical assistance.”

The project was apparently codenamed STS-XX. Computer simulations were used to test 20 sex positions, with the 10 best selected for a real-life experiment.

“Two guinea pigs tested them under actual zero-gravity conditions,” Mr. Kohler said. “The results were videotaped, but they are considered so sensitive that even NASA only received a censored version.”

While four positions were deemed viable, the remaining six, including a classic one, required a special elastic belt and an inflatable tunnel to function.

“One of the key discoveries was that the so-called classic missionary position, which is so easy on Earth when gravity pulls down, is simply not possible,” said Mr. Kohler.

Unfortunately, it was later discovered that none of the experiments were carried out.