I remember a fanfic where Cadman & others were having a conversation that Rodney overhears, where she basically says that it's obvious that the higher than usual proportion of women on the expedition was deliberate, so in the event they never made it back to Earth, they would at least be able to form a colony/civilisation, including babies (Rodney then goes into a panic because he didn't know & everyone else has a headstart & what if all the best women are taken already?).