The entire Bill Cosby affair is likely a high profile psyOp. Well documented by Mark here. I coined these psyOps Villain Celebrity Program or VCP.
Rape is a serious crime. Drugging someone without their knowledge is considered assault. Drugging someone to have sex is considered both aggravated assault and rape, and should result in a serious prison sentence, as much as thirty years plus ten, or forty per offense.
Source: The Bill Cosby Accusations – Piece of Mindful
Why did he agree to do it? Why do all these high profile actors do it? It’s part of the package, part of the deal to be (and remain) rich, or at least well compensated. Mark even speculates Cosby is old and ill, and may not know what is happening. This seems unlikely to me, especially if his immediately family might not consent for him.