http://en.wikipedia.org/wiki/Sex_in_space http://en.wikipedia.org/wiki/Sex_in_space "Numerous physiological changes have been noted during spaceflight, many of

http://en.wikipedia.org/wiki/Sex_in_space http://en.wikipedia.org/wiki/Sex_in_space "Numerous physiological changes have been noted during spaceflight, many of which may affect sex and procreation, although it remains unclear whether such effects are due to gravity changes, radiation, noise, vibration, isolation, disrupted circadian rhythms, stress, or a combination of these factors.[5]"