Since the late 1990s, new models of sexual consent have been proposed. Specifically, the development of "yes means yes" and affirmative models, such as Hall's definition: "the voluntary approval of what is done or proposed by another; permission; agreement in opinion or sentiment."[6]
Hickman and Muehlenhard state that consent should be "free verbal or nonverbal communication of a feeling of willingness' to engage in these activity." Affirmative consent may still be limited since the underlying, individual circumstances surrounding the consent cannot always be acknowledged in the "yes means yes", or in the "no means no", model
How someone feels about what happened in an encounter is very much up to interpretation and two people can see the same events very differently, each from their own perspective.
People can also have very different memories of what happened, how, in what order, and by who, all of which makes it really difficult to agree afterwards. Even though both people were in the same room, that doesn’t mean they had the same experience.