Oh, bullshit. You wrote it because a moderately explicit sex scene would sell a few books and the publishers requested it. I know better. I got the same memo. Okay, let's ditch the preteniousness right out the window, 'cause it ain't selling here.
If you're going to pretend for a moment that 'sex before marriage' was acceptable in society in any of the time periods we're talking about, then I'm going to call you either hopelessly or willfully ignorant, or a blatant liar. The fact that there are entire period pieces on this subject, illustrates just how insanely and utterly wrong you are.
You missed the entire point of the episode, the entire point of the character, the entire point of the relationship, etc. You don't have to take my word for it, since the originally author is on record about it, quite vocally. In fact, it's pretty damn hard to shut him up forty years after the fact.
You blew it. You did. You screwed up the story. You pointedly didn't understand what the episode was even about. When confronted by several people who pointed that out, you attack their supposed sexual immaturity by saying "I saw this sexual scene as a positive!" When, in fact, the whole point of the episode was that this was forlorn love. It couldn't be consumated.
So now, since we disagree with the character's outlook, because you want to emote your sexual mores onto her, rather than actually use hers, you're saying that I'm the one who's screwed up. No, that would be you, the author, who was completely and utterly unable to get into a character that you would otherwise consider alien.