It is a game with many secrets so you will not always know which ones you can have an affection unless you interact (although basically almost anyone who looks different) anyway this month I will put texts to give clues about some as you progress in the game,On levels they all have 3 levels, except the main ones that have many more, for free they can only see up to level 2, to explain it, level 1 first contact something soft, level 2 confidence and nudity and sexual games but not heavy, level 3 hard sex or scenes specials, if a secondary group is completed there is a bonus scene that involves that particular group that will always be level 4 (very hard sex or group scene with many)