In the movie, the main character, his love interest and an unassociated but still primary character declare that ATM is not okay.

Later in the movie, the tertiary character I mentioned is not present and the other two are flirting heavily. The female love interest says "in the heat of the moment, sometimes ATM is okay." (I might be paraphrasing, it's been a lot of years since I saw movie, but the sentiment is correct.) The other character then shows up and shames her.

Consent is hugely important. Even stuff like CNC very heavily depends on consent - and should. However, in the movie, I don't think it's a concept being challenged.

However, in case anything I've said implies otherwise ... No means no and begging until you get a yes is not a yes.