Well, why waste someone with reproductive value on a one way mission that will be to pave the way for actual colonists and will have 0% long term survival chances.

Send the canary first, then when the air doesn't kill it, move in.

Edit: That is to say, I don't think fertile people fucking mid trip would be a benefit, apart from nutrition calculations going out the window, I don't think we have the tech to land a pregnant person safely, and people born in orbit... probably wouldn't ideal at this stage of our tech development.

Not to mention how babies so soon after landing would affect performance.

Well, also, why waste someone with reproductive value on a one way mission that will be to pave the way for actual colonists and will have 0% long term survival chances.

Send the canary first, then when the air doesn't kill it, move in.