No worries! I'm glad I could help. :V
And I think I see what is going on. The AI first sees that the player's "Lust" stat can increase or decrease slowly over time, depending on the event taking place. Afterwards, you specify that the event must be sexual in some way to affect the stat.
Since the AI is first seeing the line that the stat can wander depending on the event taking place, that is most likely what the AI primarily runs on. Everything afterwards is just extra details that, with the current order, aren't really considered by the AI.
I think something like this might fit better:
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Player's Lust stat is a special stat that can only increase if the player is in a sexual or erotic encounter. Examples would include the player masturbating or actively engaging in sex with an entity. This stat can raise up to 25 for each prompt. The maximal value of this stat cannot be raised or lowered. It is always fixed at 150 and cannot be changed.
If no sexual or otherwise erotic events are taking place, the player's Lust stat will passively decrease over time. The maximal decrease possible is 20 for each prompt.
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A fair warning: the AI is very finnicky when it comes to managing the stats. I myself have a world that has a "Cum Meter" stat, which represents pretty much what you think. While I haven't loaded the world with the new game version yet, I previously kept having the issue that, even with strict instructions that only orgasms inside can raise the stat, the AI would decide to raise it anyway at the slightest hint of a sexual encounter. ¯\_(ツ)_/¯
So yeah, give it a try and see how it works. If that fails, we might want to use a bullet list that works like the world's rules to specify how a stat exactly works.