Like i said, never appear this option to me and neither one warrior alone on the ruins, but now, after your coment, i think that is because the PC must be bottom (or have fame of bitch?), still this doesn't explain how to increase lust of the acolyte without the quest, since, if i'm not mistaken, the number 10 must be the total of lust of warrior + acolytes.
I think the game design in this particular quest is somewhat broken, because apparently, is tottaly dependent of 1 quest, and despite given you two choices to make way later after that to get the bad ending, this only quest is the real trigger to the bad ending, and you can easly miss it.