hypercasual
A hypercasual scenario is one in which all individuals in a society are functionally free-for-use because sex has very little social weight or consequence. Typically, characters in a hypercasual situation react very little, not at all, or in a casual and friendly way to sex whether they're initiating or receiving.
Hypercasual isn't the same as public use in that one character or a class of characters isn't the object of casual sex, but instead all individuals in the scenario can be both the subject and object at any given time and a sort of universal consent is assumed.