You can't, this is the meaning of "choice"... You can reach a "perfect score" with one of them losing some points with another ones. Save game is your best friend to try all the routes
Don't bother. I mentioned this in a different game thread. Devs insist that the law and the site considers stepcest as incest so they are allowed to use the tag to 'bait' players. Obviously not in those words but that about sums up what's going on.