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Sex in space
The idea of human sexual activity in the weightlessness or extreme environments of outer space, or sex in space, presents difficulties for the performance of most sexual activities 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. There have been suggestions that conception and pregnancy in off-Earth environments could be an issue.〔(Seks in de ruimte: is het mogelijk? ), By Caroline Hoek; 7 April 2012〕〔(S’envoyer en l’air dans l’espace ) Par Kieron Monks, Metro World News; 11 Avril 2012〕
As of 2009, with NASA planning long-term missions for lunar settlements with goals to explore and colonize space, the topic has taken a respected place in life sciences. Scientist Stephen Hawking publicly concluded in 2006 that possibly human survival itself will depend on successfully contending with the extreme environments of space.
==Physiological issues==
Numerous physiological changes have been noted during spaceflight, many of which may affect sex and procreation. Such effects would be a result of factors including gravity changes, radiation, noise, vibration, isolation, disrupted circadian rhythms, stress, or a combination of these factors.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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