Yeah I wrote about it b4, but the
game's not incentivizing you to play that way.
If you're eventually going to get the rape end anyway do it first.
Rape End grants you the most easy points cause you sexually assault the girl the most.
Lewd End grants you the most points, but it's difficult cause the rape skills are costly, and you need high agility to be able to use them.
Slave End is usually a second Love End, except a female assertive one. Usually you make the right dialogue choices, don't rape, and then LOSE the final battle.
Love End is the hardest. You have to win, never rape, so no extra points if you fail, make the correct dialogue choices, and not take damage over a certain number. That's why it's last.