I'm an only child (I actually had an older sister but she only grew to be a month before she died
) and I can't imagine what it's like to have a sister. I just can't imagine not thinking she's looking good when she's looking good.
But then I should add, when I look at my mother when she was 20, I can tell that she's a beautiful girl, but I'm in no way sexually attracted to her. Strange how these things work...