I don't think there is any fruedian messages behind the dreams I have been female in.
For instance, I distinctly remember this specific dream, because of how vivid and cogent it was.
In the dream, I wake up on a dirty bed, fully clothed in a green wool and linnen dress. The era appears to be sometime during the dark ages. On the dresser, there is a tallow candle burning. The impression that I was trying to get a single moment's rest amidst an endlessly long set of tasks takes hold, and I look into the sooted silver mirror in the dresser, and note irritably how crappy my hair looks and how my dress is now all wrinked. The moment passes, and the imperitive of why I was awakened takes over, and I head for the heavy oak and iron hinged door that leads out of the small servants quarters and into the castle's back courtyard. I head to the well to draw up a fresh bucket of water, since I will need it for my work. Through the sealed portculli, I can barely scry the encampment in the distance shining in blue and white striped livery across the field, and I wryly chastise the fools and their idiocy, as all they are doing is making more bodies for me to try and mend with what few tonics, dressings, and herbal poultices I can skimp by with, as the supplies inside the castle grow ever more thin. The impression that I was unceremoniously rounded up from my normal life and shoved into the castle simply because I knew some folk remedies, and now would have to suffer the ignaminious appellation of "witch" forever because of these imbeciles was practically palpable.
I then here a "ka-chunk" and a whirring sound, and look up just in time to see a very large boulder falling down exactly on top of me.
I don't have time to react or move, but my last thought before being awakened in my real bed is "typical."
At no point was there ever really a sexual theme. I just had a curiously vivid dream of being a dark age woman during a castle siege, for no apparent reason.
I've had other dreams where I have been female. Similar situation regarding the lack of sexual themes, just with different topical themes of interest for the dreamscapes.