Do you realize that you come off as a disgusting sexist bigot here?
Is any confrontation between a man and a woman somehow "rape", unless the woman triumphs hands down, or is ugly, or fails to squeal?
Is a woman sacrosanct just because of her gender even if she happens to be a key figure in a plot to kill trillions? What possible difference is there between this scene and the one where Spock brutally forces a hapless male guard to open a door the man doesn't want opened, in "A Taste of Armageddon"? Why didn't the other captives rush Spock and beat him on the head with a stool until he bled enough to realize how monstrous it was to violate people that way?
In those cases, the act wasn't portrayed as a sexual violation. In STVI it deliberately was. Why, I have no idea. Supposedly at Nimoy's behest, although I can't fathom why. Had the prior scenes where Spock forced a meld on another been played in a similar fashion, they'd have been just as unpleasent.