Some of you posters really need to acquaint yourselves a little better with the times in which the Grand Duchesses lived, as well as with their individual characters.
Excuse me, I know what times they lived in, and exactly the regard in which sex was treated around them, as well as quite a bit about their individual personalities.
The point is that in those times, just because they were raised in a time where sex was not discussed at all, does not mean they not would have become sexually aware as young women. And at 21, you are a women. Regardless of what times you lived, at that time you are able to have children, are able to have sex, and usually you are doing both of those things by then, especially in those times. Women were married young. Even if you have no idea about any of that, you can still have sexual feelings.
And the way they were raised makes it even more likely they were feeling sexually repressed, especially considering the HUGE changes that had happened in their life. And if DID Tatiana felt like that, it doesn't de-moralize her in any way. She was religious, and extremely good, but she was a person just like us who begins to feel sexual at that age. People haven't changed.