A standard where a clear, eager yes is required — silence or lack of resistance is not consent.
Two ideas got welded together here, and it helps to keep them apart. "Affirmative consent" is the mechanical part: consent is something you give, not something assumed by default. Silence isn't a yes. A frozen body isn't a yes. The absence of resistance isn't a yes. "Enthusiastic consent" adds a quality check on top: not just permission, but wanting — the difference between someone agreeing because it's easier than arguing and someone who's actually into it. Together they replace the old "no means no" model, where sex was treated as consensual until somebody hit the brakes.
The common misconception is that "enthusiastic" means you have to be bouncing off the walls, performing desire for an audience. That's not it. Quiet, nervous, still-figuring-it-out people consent enthusiastically all the time. The bar isn't theatrical excitement — it's a real, uncoerced yes that could just as easily have been a no. If a "no" would have cost the person something (safety, the night, the relationship), then the "yes" isn't worth much. Enthusiasm is shorthand for "freely chosen," not "loud."
How it actually shows up: it's checking in instead of assuming, treating consent as ongoing rather than a one-time gate, and reading a hesitant "…sure, I guess" as a stop sign, not a green light. It also cuts both ways — it gives everyone permission to want things out loud, which is the part people forget. This is the model most modern consent education, and a growing slice of campus policy and law, is built on.