Most games, apart from an entirely abstract puzzle game, try to place you into some sort of real-life or fantasy situation that makes sense according to a system of logic, whether it's that of the real world or the game's own skewed impersonation of reality.
Adult games on mobile, however, really take it to the limit. More often than not, you're effectively playing one-on-one against a glamour model of some description, testing their skills in a game of a traditional board or puzzle game. Sure, strip poker makes sense, but strip Reversi? Adult games on mobile don't so much skew reality as skewer it alongside some roasted peppers and slap it on the grill at Hugh Hefner's Playboy barbeque bash.