There's a lot of stuff to figure out in this game.. Thought I'd post a bunch of random questions in case someone can answer them of the top of their mind...
1. Purity is mostly for immersion. And many things in this game are to roleplay. As it was mentioned, you need to stay virgin for some achievements. Some characters will tempt you to get banged if your Purity is low, notably Ettin if talking to them.
2. Scouting is a fundamental mechanic. On scouting level 1 you see the terrain in front of you, on level 2 you see the hint on character you meet, on level 3 you see the particular character. Also you will find characters that ambush you if your scouting level was less than 2 or 3. Higher Perception gives you permanently high scouting (always 2 or 3), you can raise it by tapping the button, but it consumes food, and you don't want that.
3. Red Perks can give you game overs on certain characters. For example Bitch perk 3 leads to game over with werewolves after getting banged by them.
4. Willpower sometimes is lost on certain characters if your Purity is low/you have red perks. In other cases you can call it random, but it happens when somebody tempts you. If you want to know the events that give Willpower, check the wiki for Status/Lewd.
5. Soul crystals are for magic (magic sucks on 95%) or upgrades (they are mostly for fun and role-playing, not much for usefulness).
6. Offspring is for the fun of it and role-playing. But there's a goblin game over for having a lot of offspring with her.
7. Magic in this game is hard to use. I never bothered, though they say simple healing is a good helper. If you want to tank better, you need better armor.
8. Percentage for the weight is changing on the level of your Endurance, it seems. I personally don't know why is it even shown to the player. What I understand is when your penalty is 3, you need very high Endurance, around 8, to have comfortable stamina regeneration.
9. I made this page for sexual stances:
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It tells you what stance you need to have to let opponent take you in this stance. It also tells you what stance your opponent needs to have to let you take them. Of course, you need your cock erected to do that and they need their cock erected to do you (meaning the character twice fills the bar of arousal somehow, I do that with Full Nelson -> Make Out stance, yes, it sound tricky)
I highly recommend you to use the Search option on this forum and search for the words of things you need to know, because they are being answered for 6 years now