Sure, women feel sexual pleasure during rape. That is nothing new.
We have known that for at least 5.000 years.
In fact I think the estimation of 56% is wrong. All 100% of women feel pleasure during sex, being rape or not.
The top fetish among women today is the "fake rape/fake forced sex".
However I believe that the pleasure they feel is nothing compared to the pleasure that men feel during sex.
The pleasure of sex to women is like, washing your hands in warm water in a cold day.
The pleasure of sex to men is like, finally eating after starving for 2 months. It's raw, it's visceral.
Women can have sex anytime they want. So as time went on, evolution, nature, etc. Their pleasure from sex became something normal, something mundane. Like brushing your teeth, washing your hands, taking a bath.
"Sex? Meh, I don't wanna, I am painting my nails right now."