1. The biological classification/sex of a child is determined by the father, since the woman has only x choromosomes vs the father who has xy. So: women’s gametes only have x chromosomes, vs. mens gametes have sometimes x and sometimes y chromosomes. So: If the child has xx it is biologically identified as a girl and if the child has xy then it is biologically identified as a boy.
More details: https://genetics.thetech.org/ask-a-geneticist/which-parent-decides-whether-baby-will-be-boy-or-girl
2. I think this question has been answered at great length in a couple of other questions from other students!
3. According to some sources, it seems that women can experience “wet dreams”, especially if the dreams in question are sexual in nature.