I thought the mana was “lewdness”? I’m talking about the number in the bottom left of the pause screen. It goes up by two if you leave a maiden having sex or down two if you rescue her. I think its default value is 1000.Corruption is actually your player level. The more corruption you have, the weaker you are. It's an inverse to normal leveling. You gain a small amount of exp (corruption) per battle and a large amount when defeated, hence why you level up when losing.
Horniness is just MP (your magic points or whatever you want to call it)...I think the magic skills use it...
I know this just because I went through the game in MV itself to see how it's all put together.
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