It appears that the only real difference here is consent being revoked
retroactively, ie "after the act". (Revocation "during" is easily addressed
by stopping, although males do still face the risk of a rape accusation.)
Certainly, retroactive revocation shouldn't be rape.
But there are complications, eg, regret can inspire accusation, memory
is corrupted over time. There's a big problem with many rape cases
relying largely upon personal testimony about what they remember.
Juries can rely upon the word of one person. Consent rarely has physical
corroborating evidence (eg, witnesses, documentation). Rape is a very
politically charged matter, creating prejudice, & clouding judgment.
And finally, the "proven guilty beyond a reasonable doubt" standard
isn't reliably applied by juries.
One prosecutor's experiences & views...
My default position is to believe women, but not all allegations are real. Here's how to avoid scorched-earth battles like the Kavanaugh confirmation.
www.usatoday.com
Note:
I served on a jury once. You do not want people that I saw deciding
your fate. Justice has a large random element. And it's filled with
corrupt & incompetent prosecutors, lawyers, & judges. So I favor
Blackstone's ratio.