One of the risks of living in microgravity conditions is that bones tend to lose strength over time.

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Without taking up valuable space or weight during missions, X1 could replicate common crew exercises, which are vital to keeping astronauts healthy in microgravity.

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Increased access to space will bring challenges for medical experts and scientists alike as they attempt to minimise the side-effects of space travel for the general public while promoting the exhilaration of floating in microgravity.

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The new project will send a strain of bacteria called Bacillus Subtilis into space to see if introducing different nutrients or compounds in the microgravity environment could block its growth.

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But while Logan cautions that although the act of ejaculation would likely not be impeded in space, microgravity would do nothing to enhance it.

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It was a programme that included engineering familiarisation, medical, survival and robotics training as well as microgravity or "zero-g" flights and sessions in a giant pool practising spacewalking.

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That means Mars-bound astronauts will also have to skip out on the ground-based psychological support sessions that astronauts and cosmonauts working on the international space station routinely have just to make sure microgravity has not gone to their heads (Before Soviet cosmonaut Yuri Gagarin became the first man in space in 1961, experts were afraid weightlessness might cause schizophrenia, explained one doctor).

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