If you want people to use their own API keys, you need to include a guide to them on the main description page.* It's too new a concept to expect people to inherently know what you mean.
Overall this is an intriguing idea. I'm making this comment after 1.4, and as of this writing, the AI script generation struggles badly with respecting the player's commands and the displayed stats. It tends to circle around the desired direction and never actually get there.
Meta contextually, I'm impressed you found a workable AI service that is compatible with a sexual themed game. But for your own financial security, if you haven't already you need to replace your payment method with a preloaded account, so the service cannot auto-withdraw you into a negative bank balance.
*(I consider myself an intermediate to advanced computer user with a partial CS degree, and even I'm lost. I'm not going to click on some suspicious looking link with no explanation.)