The porn video tag "tempting-titties" refers to the appeal or allure that a person's breasts, often called titties in informal language, can have. In this context, the term "tempting" suggests that the breasts are so visually attractive and seductive that they could entice someone to act upon their desires or fantasies. This tag is used by adult content creators and viewers who appreciate and enjoy watching scenes involving sexy, voluptuous, and tantalizing breasts.