While I keep hear conflicting numbers on the age thing, for this situation, I will say you are correct, they were on unequal footing. However, let's be honest on how they got there. He did not seek her out and capture her. They met she admired, and they entered into a relationship that they mutually wanted. If you say she could not know what she wanted then you infantilize her and are suggesting that 15, 16, 17 year old girls (young women) are incapable of making sound decisions. I don't buy this not for a moment. Yes, ALL 15, 16, 17 year olds make some bad decisions, it's called growing up. That is part of the process. You cannot be protected from ever making decisions (and facing consequences) and develop into a fully functioning adult.
You still never addressed my suggestion. If you are in a relationship, you have a responsibility to speak for yourself. If you don't and someone takes your timid, unenthusiastic "yes" as a yes. Then that's on you. You cannot expect them to be a mind reader. They are taking you at YOUR WORD. It's just not fair to say, "I know I said, yes, but I really wasn't into it and you should have known it."
Yes, I have been passive in sex (in the sense that I wasn't the initiator) but I also knew that at anytime I could have said "no", but didn't. I also have "gone along" or as I saw it at the time "kept the faith" because it was easier and less messy than explaining to a girl that I didn't want to have sex with her; but you know what, I owned it. i didn't blame her for my being a chicken shit. I should have have "manned up" and said, "listen, this isn't right. I don't love you and we aren't going be boyfriend and girlfriend later on." I didn't because I was 17 and didn't understand everything that was going on and what it would mean later. It was a learning experience. You can believe that I made sure all my future encounters were mutually desired.
I agree with the whole consent emphasis but unlike participating in a research study, consent cannot be retroactively withdrawn. It can be rescinded, or turned into a "stop" at any time during. However, after the fact, if you wish you hadn't then that's regret. It doesn't change that fact that you had consented. So once again, I emphasize, if this word is to have any meaning then your "yes" has to mean yes and not "if you wanna" and your "no" needs to be a clear, no, not "whatever you think".