Is this in the USC? Must have been added after last legislative session, cause it's not in my 2022 copy.
Oh, you mean it's an informal social norm relating to consensual relations between adults? Sorry: Love Wins! We've mostly dismantled those as part of the revolution.
Those hanging on to this norm are ugly or older women + ugly men. We can have norms which constrain sexual behavior again if and when people return to the notion that society exists for the common good of its citizens, not as an empty space within which the maximization of individual autonomy is the only meaningful value. Until that day, no one can take the faux-concern caterwauling about Leo's adult girlfriends as anything but what it is: the jealous screeching of insecure people without any coherent ideology on these matters.