There is no reliable account of sex in space, or even in simulated zero-G.
Here’s what we do know:
A claimed NASA document about the best sexual positions in space is an easily proved hoax.
Several astronauts have given reliable first-hand accounts of erections in space.
Several astronauts have claimed that manual masturbation occurs in space, but none have ever owned up to doing it themselves.
A single first-hand account of case of sexual harassment in space involving french kissing terminated the mission
Two astronauts secretly tied the knot just before a space mission, but are keeping completely quiet about what happened later
In a Russian experiment, male and female rats were put together for the duration of a space mission, no pregnancies ensued
ditto, some pregnant rats were taken up before being brought down for a birth that preceded normally
Bull sperm swam normally in space in a NASA experiment
A “Girls gone wild” video was made in a Russian “vomit comet” but that just had jiggling breasts
Playboy has tried many times and failed to obtain a zero-G flight
A porn film starring a Czech actress hired a private jet pilot to do a zero-G parabola, but the zero-G sex in the film was all faked
There is no record of people having sex underwater away from ground surfaces
A couple has been filmed having sex while skydiving, but that’s not a good imitation of zero-G
The Bigelow space hotel advertises the possibility of zero-G sex, but that hasn’t happened yet
Sex has been studied in dolphins, but that’s not reliable because the dolphin penis is prehensile, and there are rumours about female dolphin abilities as well.
Sex has not been observed in wild harbour seals at sea despite patient watching.
Opinions differ about whether sex in zero-G will be great or terrible. The loss of lower-body fluids due to upwards movement stopped some astronauts from having erections. The lack of things to push against could also hamper sex in zero-G. On the other hand, zex in zero-G could make the Karma Sutra obsolete.

