Massage With Benefits

The developers describe how their game uses AI generated content like this:

Visuals & Videos: All character illustrations, backgrounds, and video animations within the game have been generated using AI technology. This approach ensures high-quality visual assets and a unique artistic style that aligns perfectly with the developer's creative vision

Required on Steam store pages since 2024. It covers content that ships in the game, on its store page or in its marketing — Valve does not require a disclosure for AI tools used during development, so this says nothing either way about how the game was made. Check it on Steam.