I don't think they had sex, if that's what you're implying
"Proper" unmarried ladies in those days were not supposed to keep unchaperoned company with men.
They also weren't supposed to go walking any great length unescorted and solo night time trips into town (that all those Collins women do in 1795, 1840, and 1897) was simply not done.
Millicent takes it to an extreme, I admit, lol, when she declares that she is "ruined!" because she has been caught alone with Nathan in the drawing room. If you're not discovered or if the person who finds you in an inappropriate situation, then you're hardly socially ruined or consigned to a life as a fallen woman.
But as far as her "lost honor," it seems clear that we're supposed to believe this is her exaggerated notion, dark comic relief as it were, an indication of her mental state now and what it will be.
As for Nathan. Well, yeah, he's a cad, but he's so good looking
![Wink ;)](http://www.dsboards.com/SMF/Smileys/classic/wink.gif)
. I might add that at this point Vicki and Peter are so self-destructive, that there's absolutely nothing anyone could do to save them.
The battle for Nathan's testimony comes at a critical point in his life. I'm certainly not saying that his behavior was right, but he's got a choice of:
1. Cooperating with Trask and Joshua and rescuing his tarnished career, recovering his romance with the wealthy Millicent, and hitting the 18th century equivalent of the lottery.
2. Not perjuring himself, but risking losing absolutely everything including his career for a space case of woman who rejected him.
I don't think he did the moral, right, or correct thing, and he's a louse, no question, but it's a very pragmatic, highly practical move on his part.
Luciaphil