If you don't protest an act, you are giving your consent.
No. That's why if you have sex with a woman who has passed out, intoxicated, you can be charged with rape. Similarly, you can't simply decide to grope a woman because you feel entitled. Unless he signaled his intent and she agreed to it, that's assault. Though some of the women coming forward describe physically rebuffing him (like the woman on the airplane) it isn't necessary that they do. It's only necessary that they at no point gave consent prior to his action.
If you reciprocate vigorously in a very positive way, I would say you have given even more powerful consent.
I'd say that absent a fear of some harm, faking a thing to protect against that harm, at that point it becomes something else. But the women whose accounts I've read don't fit that description.
It used to be called romance.
No, it really didn't. No one is confused between romantic, reciprocal sexual relations and what we're speaking to in relation to the charges set against him by a number of women, or what he's speaking to in the Bush recording.
If you had to ask permission, it meant you lacked confidence and the woman would reject you
Well, no. But this isn't an area of confused fumbling where one person is wondering how far the other person is interested in taking it. This is a powerful man, outside of any prior relation, feeling entitled to approach and grope a woman because he considers himself "a star".
You have now taken normal romance and turned it into a felony
Rather, the law has recognized that no one, male or female, has a right to unilaterally decide on the course of sexual conduct. That's not a bad thing, even if it inconveniences those unaccustomed to considering more than their impulse.