well you said u didnt care for female slaves the sidequests reward you with female slaves and sex scenes with those slaves thus it wouldn't matter to you since you want a game with all male, as a sidenote the side quests dont give money or exp, the main quests also dont give xp but do give u some money but not much compared to what you can get using other methods. Quests in this game are more story based and the sidequests are not required to complete the main story.
Viewing post in First quest impossible in all male mode?
its an indie adult fantasy game, the game itself is a mix of visual novel, people management, rpgs and adventure games, and as with many games you get levels by gaining exp by defeating enemies. Examples of these games that handle leveling this way are Rpgs like fire emblem and dragon quest to name a few.
I have not played any Fire Emblem or Dragon Quest games, but it doesn't appear that those games even have quests, so... of course the quests don't give experience because they don't exist. I guess maybe Sandbox Mode (which made no sense at all to me initially, because I figured the game was already sandbox, being purportedly a management game) is more like those non-quest-based games. If that's the case though, it's really poorly tagged, and the Story Mode is incredibly poorly conceived. Should just be under RPG, not Management, and shouldn't even have a Story Mode.