They create specialized "Wall Animations," which utilize an invisible "Wicked Wall Sex Marker" object to allow Sims to interact with vertical surfaces in-game.
For a look into how custom sound effects from creators like Fruitydelicious are used within the game: Fruitydelicious animations (21.10.2022)
They utilize a Fruitydelicious Linktree to manage their various social and distribution channels. They create specialized "Wall Animations," which utilize an