Ascension by Victor Dixen

Six girls, six boys. Each in the two separate bays of a single spaceship. They have six minutes each week to seduce and to make their choices, under the unblinking eye of the on-board cameras. They are the contenders in the Genesis programme, the world’s craziest speed-dating show ever, aimed at creating the first human colony on Mars.

Leonor, an 18 year old orphan, is one of the chosen ones.
She has signed up for glory.
She has signed up for love.
She has signed up for a one-way ticket.
Even if the dream turns to a nightmare, it is too late for regrets