You know, among the religious, there are still a few people out there who swear vows of chastity and go their whole life without sex. It&#x27;s not really an irresistibly powerful human need like, say, <i>oxygen</i>. If there&#x27;s a real good reason like SPACE I&#x27;m sure we could find a few qualified people who would be willing to abstain for the rest of their life; it&#x27;s not a deal-breaker on the scales that the earliest space colonies will be recruiting from.<p>Granted, long-term colonization with a permanent population is obviously going to need some (and it will probably be small-town awkward for a while, and having your family life be everyone&#x27;s business because of population and resource planning may be an interesting step backwards for today&#x27;s liberated culture) but we can worry about that <i>after</i> we have nonzero population on Mars.