The "No Sexual Intercourse." As it sounds, not just you but also slaves without intercourse , masturbation or sexual occupations as well. Also causes you to end up going without magic as well shortly into the game without a means to replenish mana. There will also be some characters that you won't be able to utilize either. It helps if you give everyone Miko outfits. Otherwise you end up having people masturbate or go sex-crazy.
The "No slaves route." You let your starting slave go, and not have any others except for the brief times they are required for the main plot line. You are not allowed to capture anyone and must purchase those that the main plot line requires such as the human for the mage guild, the fairy (which will have to be the guild fairy, since at that point in the game you don't get the opportunity yet for buying it from anywhere else) for the mage guild, the taurus for the mage guild, the elves for the lady by the cliffs and so forth. Those who are required for the main plot line you are not allowed to have work or quest with you while you have them (Library is ok for training but nothing else).