Their argument is "enthusiastic and sober"

Reason checks out the sexual consent policies at Coastal Carolina University.
That’s right: a simple “yes” is not good enough from the standpoint of CCU administrators. Students who want to hook up must agree to each and every sex act beforehand, they must express consent enthusiastically, and they must be sober.
The university’s definition of consent is at odds with the legal one—as well as any common sense understanding of how sex happens. If complete sobriety were required before every sexual encounter, than any person who was even slightly drunk could be branded a rapist. In fact, it’s incapacitation that renders consent invalid, not mere intoxication.