losing 12 girls takes no time at all, especially on lower end machines. here's the recipe: have them in your vehicle, find one random enemy, switch them all to charge, this will stutter the game, in panic that it crashed you left click, or try to reverse. this ends up with the main canon fucking up the enemy target, all your allies, and 50 meters behind said target, once your computer comes to, its already an orgy.
or you can also just shoot each girl with your gun. those do friendly fire damage
sometimes the girls will even shoot each other, especially if you shoot something from a distance like an elephant.
bonus effect of shooting your own girl? they lose affection points so it's easier to make them convert if you want.
also, you can even put KO'ed girls onto the rover and they tend to fall out instantly when you either go nearby an enemy with everyone set to charge, or you drive over the base area by the ship with everyone set to return
and then add on that the girls have a pretty long revive time too, so you can just dump a knocked out girl at an enemy's camp like a present pretty easily. if you have a save with the final escape, then that's just free fuck fodder for the enemies to pay attention to if you shoot your own girls first
lastly, the rover exploding does a lot of damage too, especially to those in it. some might get outright KO'd if you don't mind wasting a rover